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People demonstrate in Washington on July 20, 2013, one week after the acquittal of George Zimmerman. Civil rights groups mobilized for protests in cities across the United States on Saturday amid charged emotions over the not-guilty verdict in the shooting death of unarmed black teenager Trayvon Martin. The demonstrations, which began in Miami, come a day after US President Barack Obama publicly identified with the slain 17-year-old and the deep frustrations felt among African-Americans over the verdict. NICHOLAS KAMM/AFP/Getty Images ( 521497356 )

Tracy Martin (2nd R), father of Trayvon Martin, is surrounded by members of the crowd before a group photo during a rally for his son in Miami, Florida July 20, 2013. Trayvon Martin's parents were due to lead demonstrations in New York and Miami on Saturday, as protesters across the country rallied to express anger over the acquittal of George Zimmerman, the man who shot and killed the unarmed black teenager. REUTERS/Andrew Innerarity ( USA-FLORIDA/SHOOTING )

People attend a rally led by Tracy Martin, father of Trayvon Martin, in Miami, Florida July 20, 2013. Trayvon Martin's parents were due to lead demonstrations in New York and Miami on Saturday, as protesters across the country rallied to express anger over the acquittal of George Zimmerman, the man who shot and killed the unarmed black teenager. REUTERS/Andrew Innerarity ( USA-FLORIDA/SHOOTING )

A member of the crowd wears a t-shirt with an image of President Barack Obama during a rally led by Tracy Martin, father of Trayvon Martin, in Miami, Florida July 20, 2013. Trayvon Martin's parents were due to lead demonstrations in New York and Miami on Saturday, as protesters across the country rallied to express anger over the acquittal of George Zimmerman, the man who shot and killed the unarmed black teenager. REUTERS/Andrew Innerarity ( USA-FLORIDA/SHOOTING )

Tracy Martin, father of Trayvon Martin, speaks to the crowd during a rally for his son in Miami, Florida July 20, 2013. Trayvon Martin's parents were due to lead demonstrations in New York and Miami on Saturday, as protesters across the country rallied to express anger over the acquittal of George Zimmerman, the man who shot and killed the unarmed black teenager. REUTERS/Andrew Innerarity ( USA-FLORIDA/SHOOTING )

NEW YORK, NY - JULY 20: Trayvon Martin's mother Sybrina Fulton speaks at a podium as Trayvon Martin's brother Jahvaris Fulton (L) and Rev. Al Sharpton attend a rally honoring Trayvon Martin organized by the National Action Network outside One Police Plaza in Manhattan on July 20, 2013 in New York City. Demonstrators have gathered in various cities across the country to protest the acquittal of neighborhood watchman George Zimmerman and press for his federal prosecution in the shooting death of teenager Trayvon Martin. (Photo by Kena Betancur/Getty Images) ( 174103256 )

WASHINGTON, DC - JULY 20: A woman wipes away a tear as protersters take part in a "Justice for Trayvon" vigil outside the E. Barrett Prettyman Federal Courthouse July 20, 2013 in Washington, DC. The vigil, along with others held nationwide, was organized by the National Action Network and called for federal charges to be filed against George Zimmerman in the shooting death of teenager Trayvon Martin. (Photo by Win McNamee/Getty Images) ( 174103634 )

Artist Robert Trujillo holds his son Saja Duchicela-Trujillo in front of a mural of Trayvon Martin he is working on at the Youth Radio Building in Oakland, Calif., on Friday, July 19, 2013. Trujillo is with the group "Trust Your Struggle," an artist collective in the Bay Area. The mural is being painted on the wooden boards used to cover the glass windows that were broken during a protest following the acquittal of George Zimmerman in the shooting death of Trayvon Martin. (AP Photo/Bay Area News Group, Jose Carlos Fajardo) ( Neighborhood Watch Rallies )

Allentown, PA, July 20th, 2013. Judith Joy Ross, left, of Bethlehem, and Darlene Banks, right, of Pottstown, hold signs during a "Justice for Trayvon" vigil at the Edward N. Cahn U.S. Courthouse & Federal Building in Allentown, Pa. on Saturday, July 20, 2013. Martin was a black Florida teen who was shot and killed by George Zimmerman, who said he shot the 17-year-old in self-defense. Zimmerman was acquitted of all charges. (AP Photo/The Express-Times, Matt Smith) ( Neighborhood Watch Rallies )

Showyn Walton raises his fist during a rally in support of Trayvon Martin in Athens, Ga., on Saturday, July 20, 2013. The Rev. Al Sharpton's National Action Network organized "Justice for Trayvon" rallies nationwide to press for federal civil rights charges against George Zimmerman, who was found not guilty in the shooting death of unarmed teenager Trayvon Martin. (AP Photo/The Athens Banner-Herald, AJ Reynolds) ( Neighborhood Watch Rallies )

Anna-Marie Favors holds a sign during a rally in support of Trayvon Martin in Athens, Ga., on Saturday, July 20, 2013. The Rev. Al Sharpton's National Action Network organized "Justice for Trayvon" rallies nationwide to press for federal civil rights charges against George Zimmerman, who was found not guilty in the shooting death of unarmed teenager Trayvon Martin. (AP Photo/The Athens Banner-Herald, AJ Reynolds) ( Neighborhood Watch Rallies )

WASHINGTON, DC - JULY 20: Protesters take part in a "Justice for Trayvon" vigil outside the E. Barrett Prettyman Federal Courthouse July 20, 2013 in Washington, DC. The vigil, along with others held nationwide, was organized by the National Action Network and called for federal charges to be filed against George Zimmerman in the shooting death of teenager Trayvon Martin. (Photo by Win McNamee/Getty Images) ( 174103633 )

WASHINGTON, DC - JULY 20: Protesters take part in a "Justice for Trayvon" vigil outside the E. Barrett Prettyman Federal Courthouse July 20, 2013 in Washington, DC. The vigil, along with others held nationwide, was organized by the National Action Network and called for federal charges to be filed against George Zimmerman in the shooting death of teenager Trayvon Martin. (Photo by Win McNamee/Getty Images) ( 174103629 )

A supporter attends a "Justice for Trayvon" rally on the grounds of the Wilkie D. Ferguson, Jr. United States Federal Courthouse in downtown Miami on Saturday, July 20, 2013. Trayvon Martin's father, Tracy Martin, spoke to the crowd. The Rev. Al Sharpton's National Action Network organized "Justice for Trayvon" rallies nationwide to press for federal civil rights charges against George Zimmerman, who was found not guilty in the shooting death of unarmed teenager Trayvon Martin. (AP Photo/The Miami Herald, Emily Michot) ( Neighborhood Watch Rallies )

Diya Cruz, left, marches from Frank Ogawa Plaza to the Fruitvale BART station with other protesters after a rally in Oakland, Calif., on Friday, July 19, 2013. People gathered to demonstrate in the week following the acquittal of George Zimmerman in the shooting death of Trayvon Martin. (AP Photo/Bay Area News Group, Jane Tyska) ( Neighborhood Watch Rallies )

Mya Chavis, left, adjusts a the hood of a jacket over herself while sitting with Danyse Ryan while they wait for a rally to start outside of William T. Brennan Courthouse, Saturday, July 20, 2013, in Jersey City, N.J. The Rev. Al Sharpton's National Action Network organized "Justice for Trayvon" rallies nationwide to press for federal civil rights charges against George Zimmerman, who was found not guilty in the shooting death of unarmed teenager Trayvon Martin. (AP Photo/Julio Cortez) ( Neighborhood Watch Rallies )

Singer Beyonce (R) and her husband, rapper Jay Z (rear C) depart from a rally for Trayvon Martin in New York July 20, 2013. Trayvon Martin's parents joined celebrities and hundreds of protesters on Saturday in rallies across the country to express anger over the acquittal of George Zimmerman, the man who shot and killed the unarmed black teenager. REUTERS/Carlo Allegri ( USA-FLORIDA/SHOOTING )

WASHINGTON, DC - JULY 20: Protesters take part in a "Justice for Trayvon" vigil outside the E. Barrett Prettyman Federal Courthouse July 20, 2013 in Washington, DC. The vigil, along with others held nationwide, was organized by the National Action Network and called for federal charges to be filed against George Zimmerman in the shooting death of teenager Trayvon Martin. (Photo by Win McNamee/Getty Images) ( 174103741 )

Sharon Jasper listens to speakers at a rally in New Orleans, Saturday, July 20, 2013. The Rev. Al Sharpton's National Action Network organized "Justice for Trayvon" rallies nationwide to press for federal civil rights charges against George Zimmerman, who was found not guilty in the shooting death of unarmed teenager Trayvon Martin. (AP Photo/Gerald Herbert) ( Neighborhood Watch New Orleans )

A man holds up a black hoodie in memory of Trayvon Martin at a rally July 20, 2013 in New York. Hundreds were in attendence at the NYC rally "Justice for Trayvon." Civil rights groups mobilized for protests in cities across the United States on Saturday amid charged emotions over the not-guilty verdict in the shooting death of unarmed black teenager Trayvon Martin. The demonstrations, which began in Miami, come a day after US President Barack Obama publicly identified with the slain 17-year-old and the deep frustrations felt among African-Americans over the verdict. DON EMMERT/AFP/Getty Images ( 521498129 )

WASHINGTON, DC - JULY 20: Protesters take part in a "Justice for Trayvon" vigil outside the E. Barrett Prettyman Federal Courthouse July 20, 2013 in Washington, DC. The vigil, along with others held nationwide, was organized by the National Action Network and called for federal charges to be filed against George Zimmerman in the shooting death of teenager Trayvon Martin. (Photo by Win McNamee/Getty Images) ( 174103625 )

Tracy Martin, father of Trayvon Martin, wipes his head during a rally for his son in Miami, Florida July 20, 2013. Trayvon Martin's parents were due to lead demonstrations in New York and Miami on Saturday, as protesters across the country rallied to express anger over the acquittal of George Zimmerman, the man who shot and killed the unarmed black teenager. REUTERS/Andrew Innerarity ( USA-FLORIDA/SHOOTING )

Ada Wideman and Elaine Maldonado embrace during a rally outside of William T. Brennan Courthouse, Saturday, July 20, 2013, in Jersey City, N.J. Maldonado, who met Wideman at the rally, gave her a peace bracelet she was wearing to Wideman as gift. The Rev. Al Sharpton's National Action Network organized "Justice for Trayvon" rallies nationwide to press for federal civil rights charges against George Zimmerman, who was found not guilty in the shooting death of unarmed teenager Trayvon Martin. (AP Photo/Julio Cortez) ( Neighborhood Watch Rallies )

NEW YORK, NY - JULY 20: A man holds a banner before a rally honoring Trayvon Martin outside One Police Plaza in Manhattan on July 20, 2013 in New York City. Demonstrators have gathered in various cities across the country to protest the acquittal of neighborhood watchman George Zimmerman and press for his federal prosecution in the shooting death of teenager Trayvon Martin. (Photo by Kena Betancur/Getty Images) ( 174100405 )

Sybrina Fulton (C), mother of slain teenager Trayvon Martin, departs a rally with Rev Al Sharpton (R) in New York July 20, 2013. Trayvon Martin's parents joined celebrities and hundreds of protesters on Saturday in rallies across the country to express anger over the acquittal of George Zimmerman, the man who shot and killed the unarmed black teenager. REUTERS/Carlo Allegri ( USA-FLORIDA/SHOOTING )

People gather in front of the federal court in Washington Saturday, July 20, 2013, as they demonstrate in the "Justice for Trayvon -100 City Vigil". Friday, just before the scheduled vigils and rallies in 100 U.S. cities, President Barack Obama spoke about the raw reaction to the acquittal in a Florida court of the man who shot and killed 17-year-old Trayvon Martin. Saying "Trayvon Martin could have been me, 35 years ago," Obama said he had to speak because America needs to understand why so many of her citizens are in pain about Martin's death, and why black citizens, especially, are having a hard time looking at this as anything other than the latest manifestation of what he called "a history that doesn't go away." (AP Photo/Manuel Balce Ceneta) ( Trayvon Martin )

People demonstrate in Washington on July 20, 2013, one week after the acquittal of George Zimmerman. Civil rights groups mobilized for protests in cities across the United States on Saturday amid charged emotions over the not-guilty verdict in the shooting death of unarmed black teenager Trayvon Martin. The demonstrations, which began in Miami, come a day after US President Barack Obama publicly identified with the slain 17-year-old and the deep frustrations felt among African-Americans over the verdict. NICHOLAS KAMM/AFP/Getty Images ( 521497259 )

Protesters gather for a vigil at the Fruitvale BART station after marching from a rally at Frank Ogawa Plaza in Oakland, Calif., on Friday, July 19, 2013. People gathered to demonstrate in the week following the acquittal of George Zimmerman in the shooting death of Trayvon Martin. (AP Photo/Bay Area News Group, Jane Tyska) ( Neighborhood Watch Rallies )

A woman holds a candle during a vigil at the Fruitvale BART station in Oakland, Calif., on Friday, July 19, 2013. People gathered to demonstrate in the week following the acquittal of George Zimmerman in the shooting death of Trayvon Martin. (AP Photo/Bay Area News Group, Jose Carlos Fajardo) ( APTOPIX Neighborhood Watch Rallies )