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US President Barack Obama speaks during the Let Freedom Ring Commemoration and Call to Action to commemorate the 50th anniversary of the March on Washington for Jobs and Freedom at the Lincoln Memorial in Washington, DC on August 28, 2013. The March on Washington is best remembered for King's stirring vision of a United States free of inequality and prejudice, telecast live to a nation undergoing a phenomenal decade of soul-searching, crisis and change. JEWEL SAMAD/AFP/Getty Images ( 522382003 )

President Barack Obama (L) shakes hands with former U.S. President Bill Clinton during the ceremony to commemorate the 50th anniversary of the March on Washington for Jobs and Freedom August 28, 2013 in Washington, DC. It was 50 years ago today that Martin Luther King, Jr. delivered his "I Have A Dream Speech" on the steps of the Lincoln Memorial. (Photo by Mark Wilson/Getty Images) ( 178272867 )

Rene Henry of Washington, DC, joins thousands of others during the 'Let Freedom Ring Commemoration and Call to Action' honoring the 50th anniversary of the historic March on Washington for Jobs and Freedom August 28, 2013 in Washington, DC. The 1963 landmark civil rights event was where Dr. Martin Luther King Jr. delivered his famous speech, saying, 'I still have a dream, a dream deeply rooted in the American dream...one day this nation will rise up and live up to its creed, "We hold these truths to be self evident: that all men are created equal." I have a dream . . .' (Photo by Chip Somodevilla/Getty Images) ( 178272546 )

People take shelter from the rain during the 'Let Freedom Ring Commemoration and Call to Action' honoring the 50th anniversary of the historic March on Washington for Jobs and Freedom on the National Mall August 28, 2013 in Washington, DC. The 1963 landmark civil rights event was where Dr. Martin Luther King Jr. delivered his famous speech, saying, 'I still have a dream, a dream deeply rooted in the American dream...one day this nation will rise up and live up to its creed, "We hold these truths to be self evident: that all men are created equal." I have a dream . . .' (Photo by Chip Somodevilla/Getty Images) ( 178272537 )

People take shelter from the rain during the 'Let Freedom Ring Commemoration and Call to Action' honoring the 50th anniversary of the historic March on Washington for Jobs and Freedom on the National Mall August 28, 2013 in Washington, DC. The 1963 landmark civil rights event was where Dr. Martin Luther King Jr. delivered his famous speech, saying, 'I still have a dream, a dream deeply rooted in the American dream...one day this nation will rise up and live up to its creed, "We hold these truths to be self evident: that all men are created equal." I have a dream . . .' (Photo by Chip Somodevilla/Getty Images) ( 178272542 )

Thousands of people march from Capitol Hill to the Lincoln Memorial during the 'Let Freedom Ring Commemoration and Call to Action' honoring the 50th anniversary of the historic March on Washington for Jobs and Freedom August 28, 2013 in Washington, DC. The 1963 landmark civil rights event was where Dr. Martin Luther King Jr. delivered his famous speech, saying, 'I still have a dream, a dream deeply rooted in the American dream...one day this nation will rise up and live up to its creed, "We hold these truths to be self evident: that all men are created equal." I have a dream . . .' (Photo by Chip Somodevilla/Getty Images) ( 178263032 )

People march from Capitol Hill to the Lincoln Memorial during the 'Let Freedom Ring Commemoration and Call to Action' honoring the 50th anniversary of the historic March on Washington for Jobs and Freedom August 28, 2013 in Washington, DC. The 1963 landmark civil rights event was where Dr. Martin Luther King Jr. delivered his famous speech, saying, 'I still have a dream, a dream deeply rooted in the American dream...one day this nation will rise up and live up to its creed, "We hold these truths to be self evident: that all men are created equal." I have a dream . . .' (Photo by Chip Somodevilla/Getty Images) ( 178264445 )

People gather around the reflecting pool while attending the ceremony to commemorate the 50th anniversary of the March on Washington for Jobs and Freedom August 28, 2013 in Washington, DC. It was 50 years ago today that Martin Luther King, Jr. delivered his "I Have A Dream Speech" on the steps of the Lincoln Memorial. (Photo by Mark Wilson/Getty Images) ( 178270237 )

US President Barack Obama speaks at the Lincoln Memorial on the National Mall August 28, 2013 in Washington, DC. Obama and others spoke to commemorate the 50th anniversary of the US civil rights era March on Washington where Martin Luther King Jr. delivered his "I Have a Dream Speech". BRENDAN SMIALOWSKI/AFP/Getty Images ( 522382923 )

A child listens as U.S. President Barack Obama with applause before he addresses the 'Let Freedom Ring Commemoration and Call to Action' honoring the 50th anniversary of the historic March on Washington for Jobs and Freedom on the National Mall August 28, 2013 in Washington, DC. The 1963 landmark civil rights event was where Dr. Martin Luther King Jr. delivered his famous speech, saying, 'I still have a dream, a dream deeply rooted in the American dream...one day this nation will rise up and live up to its creed, "We hold these truths to be self evident: that all men are created equal." I have a dream . . .' (Photo by Chip Somodevilla/Getty Images) ( 178278077 )

A man listens to U.S. President Barack Obama address the 'Let Freedom Ring Commemoration and Call to Action' honoring the 50th anniversary of the historic March on Washington for Jobs and Freedom on the National Mall August 28, 2013 in Washington, DC. The 1963 landmark civil rights event was where Dr. Martin Luther King Jr. delivered his famous speech, saying, 'I still have a dream, a dream deeply rooted in the American dream...one day this nation will rise up and live up to its creed, "We hold these truths to be self evident: that all men are created equal." I have a dream . . .' (Photo by Chip Somodevilla/Getty Images) ( 178278078 )

US President Barack Obama, First Lady Michelle Obama, former president Jimmy Carter and Bill Clinton arrive during the Let Freedom Ring Commemoration and Call to Action to commemorate the 50th anniversary of the March on Washington for Jobs and Freedom at the Lincoln Memorial in Washington, DC on August 28, 2013. The March on Washington is best remembered for King's stirring vision of a United States free of inequality and prejudice, telecast live to a nation undergoing a phenomenal decade of soul- ching, crisis and change. JEWEL SAMAD/AFP/Getty Images ( 522381012 )

Former Presidents Jimmy Carter and Bill Clinton arrive at the Let Freedom Ring ceremony at the Lincoln Memorial in Washington, Wednesday, Aug. 28, 2013, to commemorate the 50th anniversary of the 1963 March on Washington for Jobs and Freedom. It was 50 years ago today when Martin Luther King Jr. delivered his "I Have a Dream" speech from the steps of the memorial. (AP Photo/Carolyn Kaster) ( March on Washington Obama )

US President Barack Obama speaks during the Let Freedom Ring Commemoration and Call to Action to commemorate the 50th anniversary of the March on Washington for Jobs and Freedom at the Lincoln Memorial in Washington, DC on August 28, 2013. Thousands will gather on the mall on the anniversary of the march and Dr. Martin Luther King, Jr.'s famous "I Have a Dream" speech. SAUL LOEB/AFP/Getty Images ( 522382418 )

President Barack Obama talks with Yolanda Renee King, 5, granddaughter of Martin Luther King Jr., her mother Arndrea Waters, and Martin Luther King III, right, after speaking at a ceremony commemorating the 50th anniversary of the March on Washington, Wednesday, Aug. 28, 2013, at the Lincoln Memorial in Washington. The president was set to lead civil rights pioneers Wednesday in a ceremony for the 50th anniversary of the March on Washington, where Dr. Martin Luther King's "I Have a Dream" speech roused the 250,000 people who rallied there decades ago for racial equality. From left are, Rep. John Lewis, D-Ga., former President Jimmy Carter and former President Bill Clinton. (AP Photo/Evan Vucci) ( March on Washington Obama )

Kimberly Booker of Fort Washington, Maryland, joins thousands of others during the 'Let Freedom Ring Commemoration and Call to Action' honoring the 50th anniversary of the historic March on Washington for Jobs and Freedom on the National Mall August 28, 2013 in Washington, DC. The 1963 landmark civil rights event was where Dr. Martin Luther King Jr. delivered his famous speech, saying, 'I still have a dream, a dream deeply rooted in the American dream...one day this nation will rise up and live up to its creed, "We hold these truths to be self evident: that all men are created equal." I have a dream . . .' (Photo by Chip Somodevilla/Getty Images) ( 178272544 )

Dexter Scott King (L), son of Martin Luther King, Jr., attends the ceremony to commemorate the 50th anniversary of the March on Washington for Jobs and Freedom August 28, 2013 in Washington, DC. It was 50 years ago today that Martin Luther King, Jr. delivered his "I Have A Dream Speech" on the steps of the Lincoln Memorial. (Photo by Mark Wilson/Getty Images) ( 178270239 )

Oprah Winfrey speaks during the Let Freedom Ring Commemoration and Call to Action to commemorate the 50th anniversary of the March on Washington for Jobs and Freedom at the Lincoln Memorial in Washington, DC on August 28, 2013. Thousands will gather on the mall on the anniversary of the march and Dr. Martin Luther King, Jr.'s famous "I Have a Dream" speech. SAUL LOEB/AFP/Getty Images ( 522380370 )

Reverend Al Sharpton speaks during the Let Freedom Ring Commemoration and Call to Action to commemorate the 50th anniversary of the March on Washington for Jobs and Freedom at the Lincoln Memorial in Washington, DC on August 28, 2013. Thousands will gather on the mall on the anniversary of the march and Dr. Martin Luther King, Jr.'s famous "I Have a Dream" speech. SAUL LOEB/AFP/Getty Images ( 522379872 )

Actor and singer Jamie Foxx speaks during the Let Freedom Ring ceremony at the Lincoln Memorial August 28, 2013 in Washington, DC. The event was to commemorate the 50th anniversary of Dr. Martin Luther King Jr.'s "I Have a Dream" speech and the March on Washington for Jobs and Freedom. (Photo by Alex Wong/Getty Images) ( 178270253 )

US actor Forest Whitaker speaks during the Let Freedom Ring Commemoration and Call to Action to commemorate the 50th anniversary of the March on Washington for Jobs and Freedom at the Lincoln Memorial in Washington, DC on August 28, 2013. The March on Washington is best remembered for King's stirring vision of a United States free of inequality and prejudice, telecast live to a nation undergoing a phenomenal decade of soul-ching, crisis and change. JEWEL SAMAD/AFP/Getty Images ( 522380085 )

(L-R) John Mbugua and his son Giovanni Mbugua, 6, of San Jose, California, and Lavon Johnson and his son Mason Johnson, 2, of Fort Meade Maryland, hold hands while marching with thousands of other people from Capitol Hill to the Lincoln Memorial during the 'Let Freedom Ring Commemoration and Call to Action' honoring the 50th anniversary of the historic March on Washington for Jobs and Freedom August 28, 2013 in Washington, DC. The 1963 landmark civil rights event was where Dr. Martin Luther King Jr. delivered his famous speech, saying, 'I still have a dream, a dream deeply rooted in the American dream...one day this nation will rise up and live up to its creed, "We hold these truths to be self evident: that all men are created equal." I have a dream . . .' (Photo by Chip Somodevilla/Getty Images) ( 178264441 )

People cheer and pray during the 'Let Freedom Ring Commemoration and Call to Action' honoring the 50th anniversary of the historic March on Washington for Jobs and Freedom on the National Mall August 28, 2013 in Washington, DC. The 1963 landmark civil rights event was where Dr. Martin Luther King Jr. delivered his famous speech, saying, 'I still have a dream, a dream deeply rooted in the American dream...one day this nation will rise up and live up to its creed, "We hold these truths to be self evident: that all men are created equal." I have a dream . . .' (Photo by Chip Somodevilla/Getty Images) ( 178267309 )

People march from Capitol Hill to the Lincoln Memorial during the 'Let Freedom Ring Commemoration and Call to Action' honoring the 50th anniversary of the historic March on Washington for Jobs and Freedom August 28, 2013 in Washington, DC. The 1963 landmark civil rights event was where Dr. Martin Luther King Jr. delivered his famous speech, saying, 'I still have a dream, a dream deeply rooted in the American dream...one day this nation will rise up and live up to its creed, "We hold these truths to be self evident: that all men are created equal." I have a dream . . .' (Photo by Chip Somodevilla/Getty Images) ( 178263035 )

A man marches from Capitol Hill to the Lincoln Memorial during the 'Let Freedom Ring Commemoration and Call to Action' honoring the 50th anniversary of the historic March on Washington for Jobs and Freedom August 28, 2013 in Washington, DC. The 1963 landmark civil rights event was where Dr. Martin Luther King Jr. delivered his famous speech, saying, 'I still have a dream, a dream deeply rooted in the American dream...one day this nation will rise up and live up to its creed, "We hold these truths to be self evident: that all men are created equal." I have a dream . . .' (Photo by Chip Somodevilla/Getty Images) ( 178264450 )

People listen to speaker at the Lincoln Memorial in Washington, DC, on August 28, 2013 during a ceremony to commemorate of the 50th anniversary on the March on Washington, the civil rights watershed where Martin Luther King Jr famously declared: "I have a dream." The March on Washington is best remembered for King's stirring vision of a United States free of inequality and prejudice, telecast live to a nation undergoing a phenomenal decade of soul-searching, crisis and change. JEWEL SAMAD/AFP/Getty Images ( 522378578 )

People crowd near the Lincoln Memorial in Washington, DC, on August 28, 2013 to take part in a commemorating of the 50th anniversary on the March on Washington, the civil rights watershed where Martin Luther King Jr famously declared: "I have a dream." The March on Washington is best remembered for King's stirring vision of a United States free of inequality and prejudice, telecast live to a nation undergoing a phenomenal decade of soul-searching, crisis and change. JEWEL SAMAD/AFP/Getty Images ( 522378564 )

The group Junkaroo performs at the Let Freedom Ring ceremony at the Lincoln Memorial in Washington, Wednesday, Aug. 28, 2013, to commemorate the 50th anniversary of the 1963 March on Washington for Jobs and Freedom. It was 50 years ago today when Martin Luther King Jr. delivered his "I Have a Dream" speech from the steps of the memorial. (AP Photo/Carolyn Kaster) ( March on Washington Obama )

Performers from the Bahamas dance a Junkanoo during the Let Freedom Ring Commemoration and Call to Action to commemorate the 50th anniversary of the March on Washington for Jobs and Freedom at the Lincoln Memorial in Washington, DC on August 28, 2013. Thousands will gather on the mall on the anniversary of the march and Dr. Martin Luther King, Jr.'s famous "I Have a Dream" speech. SAUL LOEB/AFP/Getty Images ( 522378360 )

Betty Waller Gray (C) of Richmond, Virginia, cheers during the 'Let Freedom Ring Commemoration and Call to Action' honoring the 50th anniversary of the historic March on Washington for Jobs and Freedom on the National Mall August 28, 2013 in Washington, DC. The 1963 landmark civil rights event was where Dr. Martin Luther King Jr. delivered his famous speech, saying, 'I still have a dream, a dream deeply rooted in the American dream...one day this nation will rise up and live up to its creed, "We hold these truths to be self evident: that all men are created equal." I have a dream . . .' (Photo by Chip Somodevilla/Getty Images) ( 178267307 )

Rev. Joseph Lowery, former president of the Southern Christian Leadership Conference, speaks at the 50th Anniversary of the March on Washington where Martin Luther King, Jr., spoke, Wednesday, Aug. 28, 2013, at the Lincoln Memorial in Washington. (AP Photo/Charles Dharapak) ( March On Washington Obama )

Seventh-day Adventist minister and vocal artist Rev. Wintley Phipps, Sr., sings during the Let Freedom Ring ceremony at the Lincoln Memorial August 28, 2013 in Washington, DC. The event was to commemorate the 50th anniversary of Dr. Martin Luther King Jr.'s "I Have a Dream" speech and the March on Washington for Jobs and Freedom. (Photo by Alex Wong/Getty Images) ( 178267028 )

With Trayvon Martin parents, Sybrina Fulton, and Tracy Martin, and Mark Barden, father of Sandy Hook Elementary School shooting victim Daniel Barden, Peter Yarrow, left, and Paul Stookey, right, of the folk trio Peter, Paul and Mary, perform at the 50th Anniversary of the March on Washington where Martin Luther King, Jr., spoke, Wednesday, Aug. 28, 2013, in front of the Lincoln Memorial in Washington. (AP Photo/Charles Dharapak) ( March On Washington Obama )

Rev. Al Sharpton (R) stands under an umbrella during the "Let Freedom Ring" ceremony to commemorate the 50th anniversary of the March on Washington for Jobs and Freedom , August 28, 2013 in Washington. It was 50 years ago today that Martin Luther King, Jr. delivered his "I Have A Dream Speech" on the steps of the Lincoln Memorial. (Photo by Mark Wilson/Getty Images) ( 178267160 )

The Lincoln Memorial is reflected in the glasses of Christina Bostik during the "Let Freedom Ring" ceremony to commemorate the 50th anniversary of the March on Washington for Jobs and Freedom August 28, 2013 in Washington. It was 50 years ago today that Martin Luther King, Jr. delivered his "I Have A Dream Speech" on the steps of the Lincoln Memorial. (Photo by Mark Wilson/Getty Images) ( 178264968 )

Director of the National Park Service Jonathan Jarvis (R) speaks as Washington, D.C. Mayor Vincent Gray listens during the Let Freedom Ring ceremony at the Lincoln Memorial August 28, 2013 in Washington, DC. The event was to commemorate the 50th anniversary of Dr. Martin Luther King Jr.'s "I Have a Dream" speech and the March on Washington for Jobs and Freedom. (Photo by Alex Wong/Getty Images) ( 178267002 )

Singer Natalie Grant performs during the Let Freedom Ring Commemoration and Call to Action to commemorate the 50th anniversary of the March on Washington for Jobs and Freedom at the Lincoln Memorial in Washington, DC on August 28, 2013. Thousands will gather on the mall on the anniversary of the march and Dr. Martin Luther King, Jr.'s famous "I Have a Dream" speech. SAUL LOEB/AFP/Getty Images ( 522378414 )

Audience members sit in rain for the 50th Anniversary of the March on Washington, Wednesday, Aug. 28, 2013, in front of the Lincoln Memorial in Washington, where Martin Luther King, Jr. spoke. President Barack Obama is scheduled to speak later in the day. (AP Photo/Charles Dharapak) ( March On Washington Obama )

Guests wear ponchos in the rain during the Let Freedom Ring Commemoration and Call to Action to commemorate the 50th anniversary of the March on Washington for Jobs and Freedom at the Lincoln Memorial in Washington, DC on August 28, 2013. Thousands will gather on the mall on the anniversary of the march and Dr. Martin Luther King, Jr.'s famous "I Have a Dream" speech. SAUL LOEB/AFP/Getty Images ( 522379228 )

Former United Nations Ambassador Andrew Young speaks at the Let Freedom Ring ceremony at the Lincoln Memorial in Washington, Wednesday, Aug. 28, 2013, to commemorate the 50th anniversary of the 1963 March on Washington for Jobs and Freedom. It was 50 years ago today when Martin Luther King Jr. delivered his "I Have a Dream" speech from the steps of the memorial. (AP Photo/Carolyn Kaster) ( March on Washington Obama )

People brave light rain as they arrive near at the Lincoln Memorial in Washington, DC, on August 28, 2013 to commemorate the 50th anniversary on the March on Washington, the civil rights watershed where Martin Luther King Jr famously declared: "I have a dream." The March on Washington is best remembered for King's stirring vision of a United States free of inequality and prejudice, telecast live to a nation undergoing a phenomenal decade of soul-searching, crisis and change. JEWEL SAMAD/AFP/Getty Images ( 522377963 )

Melanie Campbell, president & CEO of the National Coalition on Black Civic Participation, speaks at the Let Freedom Ring ceremony at the Lincoln Memorial in Washington, Wednesday, Aug. 28, 2013, to commemorate the 50th anniversary of the 1963 March on Washington for Jobs and Freedom. It was 50 years ago today when Martin Luther King Jr. delivered his "I Have a Dream" speech from the steps of the memorial. The bell at rear rang at the 16th St Baptist Church in Birmingham, Ala. which was bombed 18 days after the March On Washington killing four young girls. (AP Photo/Carolyn Kaster) ( March on Washington Obama )

Kristin Stoneking, executive director of the Fellowship of Reconciliation, speaks at the 50th Anniversary of the March on Washington where Martin Luther King, Jr., spoke, Wednesday, Aug. 28, 2013, at the Lincoln Memorial in Washington. (AP Photo/Charles Dharapak) ( March On Washington Obama )

The Maori Dancers perform at the 50th Anniversary of the March on Washington where Martin Luther King, Jr., spoke, Wednesday, Aug. 28, 2013, at the Lincoln Memorial in Washington. (AP Photo/Charles Dharapak) ( March On Washington Obama )

Traditional Maori dancers from Destiny Church, New Zealand perform during the Let Freedom Ring Commemoration and Call to Action to commemorate the 50th anniversary of the March on Washington for Jobs and Freedom at the Lincoln Memorial in Washington, DC on August 28, 2013. Thousands will gather on the mall on the anniversary of the march and Dr. Martin Luther King, Jr.'s famous "I Have a Dream" speech. SAUL LOEB/AFP/Getty Images ( 522378876 )

Audience members sing during the benediction for the 50th Anniversary of the March on Washington where Martin Luther King, Jr., spoke, Wednesday, Aug. 28, 2013, in front of the Lincoln Memorial in Washington. (AP Photo/Charles Dharapak) ( March On Washington Obama )

Brianna Renner, 11, left, and Morgan Koroma, 11, both from Cora Rich Elementary School in Prince Georges County, Md., read and write down quotes from Martin Luther King's speeches and writings, inscribed on the wall at the Martin Luther King Memorial in Washington, Wednesday, Aug. 28, 2013, during the Let Freedom Ring ceremony commemorating the 50th Anniversary of the March on Washington for Jobs and Freedom. Renner, a sixth grader, said that they are writing the quotes that they'll discuss in their Social Studies class, and pick which one they think is one that stands out most. (AP Photo/Manuel Balce Ceneta) ( March On Washington )

The T-shirt of a woman is pictured as people brave light rain near at the Lincoln Memorial in Washington, DC, on August 28, 2013 to commemorate the 50th anniversary on the March on Washington, the civil rights watershed where Martin Luther King Jr famously declared: "I have a dream." The March on Washington is best remembered for King's stirring vision of a United States free of inequality and prejudice, telecast live to a nation undergoing a phenomenal decade of soul-searching, crisis and change. JEWEL SAMAD/AFP/Getty Images ( 522377719 )

Placards lay on the ground at the Lincoln Memorial in Washington, DC, on August 28, 2013 during a ceremony to commemorate of the 50th anniversary on the March on Washington, the civil rights watershed where Martin Luther King Jr famously declared: "I have a dream." The March on Washington is best remembered for King's stirring vision of a United States free of inequality and prejudice, telecast live to a nation undergoing a phenomenal decade of soul-searching, crisis and change. JEWEL SAMAD/AFP/Getty Images ( 522378831 )

Jeanne Smiley, front right, of Montgomery, Ala., rings her bell along with others during ceremonies honoring the 50th anniversary of the Martin Luther King Jr., "I Have a Dream" speech in Montgomery, Ala., Wednesday, Aug. 28, 2013. The ceremony took place outside the Dexter Ave. King Memorial Baptist Church where King was pastor from 1954 through 1960.. Smiley said "Rev. King was a great man who helped make this country a better place to live." (AP Photo/Dave Martin) ( March On Washington Bells )

Christine King Farris, sister of slain civil rights leader Martin Luther King Jr., speaks at the Lincoln Memorial on the National Mall August 28, 2013 in Washington, DC. during the 50th anniversary of the US civil rights era March on Washington where Martin Luther King delivered his "I Have a Dream Speech". AFP PHOTO/Brendan SMIALOWSKI/AFP/Getty Images ( 522384927 )

The Reverend Jesse Jackson and other wait to listen to US President Barack Obama speak at the Lincoln Memorial on the National Mall August 28, 2013 in Washington, DC. Obama and others spoke to commemorate the 50th anniversary of the US civil rights era March on Washington where Martin Luther King Jr. delivered his "I Have a Dream Speech". AFP PHOTO/Brendan SMIALOWSKI/AFP/Getty Images ( 522384275 )

Kimberly Booker of Fort Washington, Maryland, joins thousands of others during the 'Let Freedom Ring Commemoration and Call to Action' honoring the 50th anniversary of the historic March on Washington for Jobs and Freedom on the National Mall August 28, 2013 in Washington, DC. The 1963 landmark civil rights event was where Dr. Martin Luther King Jr. delivered his famous speech, saying, 'I still have a dream, a dream deeply rooted in the American dream...one day this nation will rise up and live up to its creed, "We hold these truths to be self evident: that all men are created equal." I have a dream . . .' (Photo by Chip Somodevilla/Getty Images) ( 178272544 )

President Barack Obama (L) stands with his wife Michelle Obama (2nd-R) and former presidents Jimmy Carter (2nd-L) and Bill Clinton (R) during the ceremony to commemorate the 50th anniversary of the March on Washington for Jobs and Freedom August 28, 2013 in Washington, DC. It was 50 years ago today that Martin Luther King, Jr. delivered his "I Have A Dream Speech" on the steps of the Lincoln Memorial. (Photo by Mark Wilson/Getty Images) ( 178285820 )

Betty Waller Gray of Richmond, Virginia, cheers during the 'Let Freedom Ring Commemoration and Call to Action' honoring the 50th anniversary of the historic March on Washington for Jobs and Freedom on the National Mall August 28, 2013 in Washington, DC. (Photo by Chip Somodevilla/Getty Images) ( 178272548 )

A woman gathers on the National Mall during the 'Let Freedom Ring Commemoration and Call to Action' honoring the 50th anniversary of the historic March on Washington for Jobs and Freedom August 28, 2013 in Washington, DC. The 1963 landmark civil rights event was where Dr. Martin Luther King Jr. delivered his famous speech, saying, 'I still have a dream, a dream deeply rooted in the American dream...one day this nation will rise up and live up to its creed, "We hold these truths to be self evident: that all men are created equal." I have a dream . . .' (Photo by Chip Somodevilla/Getty Images) ( 178272536 )

A woman gathers on the National Mall during the 'Let Freedom Ring Commemoration and Call to Action' honoring the 50th anniversary of the historic March on Washington for Jobs and Freedom August 28, 2013 in Washington, DC. The 1963 landmark civil rights event was where Dr. Martin Luther King Jr. delivered his famous speech, saying, 'I still have a dream, a dream deeply rooted in the American dream...one day this nation will rise up and live up to its creed, "We hold these truths to be self evident: that all men are created equal." I have a dream . . .' (Photo by Chip Somodevilla/Getty Images) ( 178272531 )

People sit in the rain during a ceremony to commemorate the 50th anniversary of the March on Washington for Jobs and Freedom , August 28, 2013 in Washington. It was 50 years ago today that Martin Luther King, Jr. delivered his "I Have A Dream Speech" on the steps of the Lincoln Memorial. (Photo by Mark Wilson/Getty Images) ( 178267904 )

WASHINGTON, DC - AUGUST 28: Betty Waller Gray (C) of Richmond, Virginia, listens during the 'Let Freedom Ring Commemoration and Call to Action' honoring the 50th anniversary of the historic March on Washington for Jobs and Freedom on the National Mall August 28, 2013 in Washington, DC. The 1963 landmark civil rights event was where Dr. Martin Luther King Jr. delivered his famous speech, saying, 'I still have a dream, a dream deeply rooted in the American dream...one day this nation will rise up and live up to its creed, "We hold these truths to be self evident: that all men are created equal." I have a dream . . .' (Photo by Chip Somodevilla/Getty Images) ( 178267712 )

Rep, John Lewis, D-Ga. speaks at the Let Freedom Ring ceremony at the Lincoln Memorial in Washington, Wednesday, Aug. 28, 2013, to commemorate the 50th anniversary of the 1963 March on Washington for Jobs and Freedom. It was 50 years ago today when Martin Luther King Jr. delivered his "I Have a Dream" speech from the steps of the memorial. (AP Photo/Carolyn Kaster) ( March on Washington Obama )

Martin Luther King III, right, his wife Arndrea Waters, left, and their daughter Yolanda Renee King, listen as President Barack Obama speaks a ceremony commemorating the 50th anniversary of the March on Washington, Wednesday, Aug. 28, 2013, at the Lincoln Memorial in Washington. The president was set to lead civil rights pioneers Wednesday in a ceremony for the 50th anniversary of the March on Washington, where Dr. Martin Luther King's "I Have a Dream" speech roused the 250,000 people who rallied there decades ago for racial equality. (AP Photo/Evan Vucci) ( March on Washington Obama )

Jeanne Smiley of Montgomery, Ala., holds her bell during ceremonies honoring the 50th anniversary of the Martin Luther King Jr., "I Have a Dream" speech in Montgomery, Ala., Wednesday, Aug. 28, 2013. The ceremony took place outside the Dexter Ave. King Memorial Baptist Church where King became pastor in 1954. Smiley said "Rev. King was a great man who helped make this country a better place to live." (AP Photo/Dave Martin) ( APTOPIX March On Washington Bells )

Former Boston Celtics basketball player Bill Russell speaks at the Let Freedom Ring ceremony at the Lincoln Memorial in Washington,Wednesday, Aug. 28, 2013, to commemorate the 50th anniversary of the 1963 March on Washington for Jobs and Freedom. It was 50 years ago today when Martin Luther King Jr. delivered his "I Have a Dream" speech from the steps of the memorial. (AP Photo/Carolyn Kaster) ( March on Washington Obama )

Entertainer Forest Whitaker speaks at the Let Freedom Ring ceremony at the Lincoln Memorial in Washington, Wednesday, Aug. 28, 2013, to commemorate the 50th anniversary of the 1963 March on Washington for Jobs and Freedom. It was 50 years ago today when Martin Luther King Jr. delivered his "I Have a Dream" speech from the steps of the memorial. (AP Photo/Carolyn Kaster) ( March on Washington Obama )

Rev. Dr. Bernice King, CEO of The King Center for Non-Violent Social Change, and daughter of Martin Luther King Jr., speaks at the Let Freedom Ring ceremony at the Lincoln Memorial in Washington, Wednesday, Aug. 28, 2013, to commemorate the 50th anniversary of the 1963 March on Washington for Jobs and Freedom. It was 50 years ago today when Martin Luther King Jr. delivered his "I Have a Dream" speech from the steps of the memorial. (AP Photo/Carolyn Kaster) ( March On Washington Obama )

Illinois Gov. Pat Quinn left, and Chicago Alderman Deborah Graham, watch as Rev. James Moody finishes ringing a bell at 3:00 PM eastern time to commemorate the 50th anniversary of Dr. Martin Luther King's "I Have a Dream" speech at Quinn Chapel AME Church Wednesday, Aug. 28, 2013, in Chicago. King gave his famous speech 50 years ago today during the march on Washington. Quinn Chapel AME Church is Illinois' oldest African American congregation and King once spoke from the pulpit there. (AP Photo/M. Spencer Green) ( March On Washington Bells )

The family of Martin Luther King Jr. including , Martin Luther King III, son of Martin Luther King Jr., and his wife Arndrea Waters and daughter Yolanda Renee King react after ringing a bell at the Let Freedom Ring ceremony,, Wednesday, Aug. 28, 2013, at the Lincoln Memorial in Washington, to commemorate the 50th anniversary of the 1963 March on Washington for Jobs and Freedom. It was 50 years ago today when Martin Luther King Jr. delivered his "I Have a Dream" speech from the steps of the memorial. The bell rang at the 16th St Baptist Church in Birmingham, Ala. which was bombed 18 days after the March On Washington killing four young girls. (AP Photo/Carolyn Kaster) ( March On Washington Obama )

People of mixed races hold hands during a prayer outside the Dexter Ave. King Memorial Baptist Church in Montgomery, Ala., Wednesday, Aug. 28, 2013. Members were holding a bell ringing ceremony to honor the 50th anniversary of the "I Had a Dream" speech by Rev. Martin Luther King Jr., who was pastor of the church in 1954. (AP Photo/Dave Martin) ( APTOPIX March On Washington Bells )