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Aztec dancers perform during a May Day rally and march to the Minnesota State Capitol to call for immigration reform Wednesday, May 1, 2013 in St. Paul, Minn. (AP Photo/Jim Mone) ( Immigration Marches )

Marchers participate during a May Day rally in downtown Los Angeles, Wednesday, May 1, 2013. In celebration of May Day thousands have gathered for an immigration reform rally in downtown. (AP Photo/Jae C. Hong) ( Immigration Marches Los Angeles )

Demonstrators calling for immigration reform march to the Minnesota State Capitol for a May Day rally Wednesday, May 1, 2013 in St. Paul, Minn. (AP Photo/Jim Mone) ( Immigration Marches )

A crowd gathers for a May Day rally in Portland, Ore., Wednesday, May 1, 2013.(AP Photo/Don Ryan) ( Immigration Marches Oregon )

Students and workers parade through the streets of San Diego, during a May Day demonstration and march in California May 1, 2013. Workers' rights and immigration reform were supported in the demonstration. REUTERS/Mike Blake ( USA-MAYDAY/PROTESTS )

Dancers participate in an immigration reform May Day rally in Union Square in New York, Wednesday, May 1, 2013. Demonstrators demanded an overhaul of U.S. immigration laws Wednesday in an annual nationwide ritual that carried a special sense of urgency as Congress considers sweeping legislation that would bring many of the estimated 11 million people living in the U.S. illegally out of the shadows. (AP Photo/Seth Wenig) ( Immigration Marches )

People gather at the Capitol to witness Gov. John Kitzhaber signing Senate Bill 833 during a May Day Rally on the Capitol steps, in Salem, Ore., on Wednesday, May 1, 2013. As a throng of supporters cheered, Gov. John Kitzhaber signed a bill Wednesday that will let immigrants living in Oregon without legal permission obtain driver's licenses. (AP Photo/Statesman Journal, Timothy J. Gonzalez) ( Immigration Rally Oregon )

May 1, 2013 - Salem, OR - A Native American dancer performs for a crowd at the start of a May Day rally, a traditional day of celebrating working people, on the steps of the State Capitol in Salem, Ore. on Wednesday, May 1, 2013. (AP Photo/The Oregonian, Beth Nakamura) ( May Day Rally )

CHICAGO, IL - MAY 01: Demonstrators participate in a May Day march on May 1, 2013 in Chicago, Illinois. Hundreds of marchers participated in the two-mile march from the city's West side into the Loop. The majority of the marchers were protesting for immigration reform. (Photo by Scott Olson/Getty Images) ( 167858811 )

CHICAGO, IL - MAY 01: A portrait of President Barack Obama hangs in the Federal Building Plaza as demonstrators begin to gather following a May Day march on May 1, 2013 in Chicago, Illinois. Hundreds of protestors participated in the two-mile march from the city's West side into the Loop. The majority of the marchers were protesting for immigration reform. (Photo by Scott Olson/Getty Images) ( 167858807 )

NEW YORK, NY - MAY 01: Thousands of people march down Broadway on International Workers Day, or Labor Day, on May 1, 2013 in New York City. The annual global gathering of immigration rights activists, leftists, labor unions and others often results in confrontations with police. The very first Labor Day in America took place on May 1, 1886, as a celebration of the American labor movement and the adoption of the 8-hour work day. (Photo by Spencer Platt/Getty Images) ( 167858824 )

NEW YORK, NY - MAY 01: Thousands of people march down Broadway on International Workers Day, or Labor Day, on May 1, 2013 in New York City. The annual global gathering of immigration rights activists, leftists, labor unions and others often results in confrontations with police. The very first Labor Day in America took place on May 1, 1886, as a celebration of the American labor movement and the adoption of the 8-hour work day. (Photo by Spencer Platt/Getty Images) ( 167858825 )

NEW YORK, NY - MAY 01: People run down Broadway in Manhattan on International Workers Day, or Labor Day, on May 1, 2013 in New York City. The annual May Day global gathering of immigration rights activists, leftists, labor unions and others often results in confrontations with police. The very first Labor Day in America took place on May 1, 1886, as a celebration of the American labor movement and the adoption of the 8-hour work day. (Photo by Mario Tama/Getty Images) ( 167859082 )

LOS ANGELES, CA - MAY 01: Thousands of people participate in the May Day march and rally on May 1, 2013 in Los Angeles, California. Labor organizations and immigration groups used the annual celebration to push for an immigration system overhaul. (Photo by Kevork Djansezian/Getty Images) ( 167859092 )

NEW YORK, NY - MAY 01: People run down Broadway in Manhattan on International Workers Day, or Labor Day, on May 1, 2013 in New York City. The annual May Day global gathering of immigration rights activists, leftists, labor unions and others often results in confrontations with police. The very first Labor Day in America took place on May 1, 1886, as a celebration of the American labor movement and the adoption of the 8-hour work day. (Photo by Mario Tama/Getty Images) ( 167859254 )

NEW YORK, NY - MAY 01: People run down Broadway in Manhattan on International Workers Day, or Labor Day, on May 1, 2013 in New York City. The annual May Day global gathering of immigration rights activists, leftists, labor unions and others often results in confrontations with police. The very first Labor Day in America took place on May 1, 1886, as a celebration of the American labor movement and the adoption of the 8-hour work day. (Photo by Mario Tama/Getty Images) ( 167859212 )

Demonstrators take part in a May Day march, in New York, May 1, 2013. Union workers, immigrant rights activists and Occupy Wall Street supporters staged a rally and a march to celebrate May Day. EMMANUEL DUNAND/AFP/Getty Images ( 519399293 )

Jorge Zamora, from Mexico, joins a May Day rally in Portland, Ore., Wednesday, May 1, 2013.(AP Photo/Don Ryan) ( Immigration Marches Oregon )

Demonstrators take part in a May Day march in New York, May 1, 2013. Union workers, immigrant rights activists and Occupy Wall Street supporters staged a rally and a march to celebrate May Day. EMMANUEL DUNAND/AFP/Getty Images ( 519399275 )

Saul Linares participates in an immigration reform May Day rally in Union Square in New York, Wednesday, May 1, 2013. Demonstrators demanded an overhaul of U.S. immigration laws Wednesday in an annual nationwide ritual that carried a special sense of urgency as Congress considers sweeping legislation that would bring many of the estimated 11 million people living in the U.S. illegally out of the shadows. (AP Photo/Seth Wenig) ( Immigration Marches )

Martina Cano joins others in a May Day march for immigration reform from the Children's Museum to Calder Plaza in Grand Rapids, Mich. on Wednesday, May 1, 2013. (AP Photo/MLive.com, Latara Appleby) ( Immigration Marches May Day )

Marchers walk along during a rally in downtown Los Angeles, Wednesday, May 1, 2013. In celebration of May Day thousands have gathered for an immigration reform rally in downtown. (AP Photo/Jae C. Hong) ( Immigration Marches Los Angeles )

Union workers march along the street with a huge American flag during a May Day rally in Los Angeles, Wednesday, May 1, 2013. In celebration of May Day, people have gathered across the country to rally for various topics including immigration reform. (AP Photo/Jae C. Hong) ( Immigration Marches Los Angeles )

Marchers walk along during a rally in downtown Los Angeles, Wednesday, May 1, 2013. In celebration of May Day thousands have gathered for an immigration reform rally in downtown. (AP Photo/Jae C. Hong) ( Immigration Marches Los Angeles )

Immigrants and activists march during a rally in Chicago, Wednesday, May 1, 2013. Thousands of marchers have made their way through downtown Chicago to a rally in support of easing the nation's immigration laws. (AP Photo/Charles Rex Arbogast) ( Immigration Marches )

Demonstrators calling for immigration reform march to the Minnesota State Capitol during a May Day rally Wednesday, May 1, 2013 in St. Paul, Minn. (AP Photo/Jim Mone) ( Immigration Marches )

A youth carries national flags of the U.S. and Mexico through the streets of San Diego, during a May Day demonstration and march in California May 1, 2013. Workers' rights and immigration reform were supported in the demonstration. REUTERS/Mike Blake ( USA-MAYDAY/PROTESTS )

LOS ANGELES, CA - MAY 01: Celebrants participate in the May Day march and rally on May 1, 2013 in Los Angeles, California. Labor organizations and immigration groups used the annual celebration to push for an immigration system overhaul. (Photo by Kevork Djansezian/Getty Images) ( 167859518 )

Alma Banuelos, left, with Emilia Hernandez shout slogans during a rally in downtown Los Angeles Wednesday, May 1, 2013. In celebration of May Day thousands have gathered for an immigration reform rally in downtown Los Angeles. (AP Photo/Nick Ut) ( Immigration Marches Los Angeles )

Thousands of people march during a May Day rally in downtown Los Angeles on Wednesday, May 1, 2013. In celebration of May Day, people have gathered across the country to rally for various topics including immigration reform. (AP Photo/Damian Dovarganes) ( May Day Rallies )

Maria Fernanda Medina, 7, wraps herself in a United States flag as she marches with her father, Jorge, during a May Day demonstration in San Francisco, Wednesday, May 1, 2013. Demonstrators demanded an overhaul of immigration laws Wednesday in an annual, nationwide ritual that carried a special sense of urgency as Congress considers sweeping legislation that would bring many of the estimated 11 million people living in the U.S. illegally out of the shadows. (AP Photo/Marcio Jose Sanchez) ( APTOPIX Immigration Marches May Day )

Troy Flores wears a costume during a May Day demonstration in San Francisco, Wednesday, May 1, 2013. Demonstrators demanded an overhaul of immigration laws Wednesday in an annual, nationwide ritual that carried a special sense of urgency as Congress considers sweeping legislation that would bring many of the estimated 11 million people living in the U.S. illegally out of the shadows. (AP Photo/Marcio Jose Sanchez) ( Immigration Marches May Day )

Protesters march down Mission Street during a May Day demonstration in San Francisco, Wednesday, May 1, 2013. Demonstrators demanded an overhaul of immigration laws Wednesday in an annual, nationwide ritual that carried a special sense of urgency as Congress considers sweeping legislation that would bring many of the estimated 11 million people living in the U.S. illegally out of the shadows. (AP Photo/Marcio Jose Sanchez) ( Immigration Marches May Day )

Protesters take part in a May Day immigration rights march, Wednesday, May 1, 2013 in downtown Seattle. Demonstrators demanded an overhaul of immigration laws Wednesday in an annual, nationwide ritual that carried a special sense of urgency as Congress considers sweeping legislation that would bring many of the estimated 11 million people living in the U.S. illegally out of the shadows. (AP Photo/Ted S. Warren) ( May Day Immigration Marches )

Eric Balli, who is from Mexico, but lives in Everett, Wash., takes part in a May Day immigration rights march, Wednesday, May 1, 2013 in downtown Seattle. Demonstrators demanded an overhaul of immigration laws Wednesday in an annual, nationwide ritual that carried a special sense of urgency as Congress considers sweeping legislation that would bring many of the estimated 11 million people living in the U.S. illegally out of the shadows. (AP Photo/Ted S. Warren) ( May Day Immigration Marches )

Marchers pass murals during a May Day rally Wednesday, May 1, 2013, in San Diego. Hundreds of people marched to Chicano Park Wednesday to show support for workers rights and immigration reform. (AP Photo/Gregory Bull) ( Immigration Marches May Day )

Rosa Araujo, center, leads a large crowd of protesters during a May Day rally in Los Angeles, Wednesday, May 1, 2013. Demonstrators demanded an overhaul of immigration laws Wednesday in an annual, nationwide ritual that carried a special sense of urgency as Congress considers sweeping legislation that would bring many of the estimated 11 million people living in the U.S. illegally out of the shadows. (AP Photo/Jae C. Hong) ( APTOPIX May Day Immigration Marches )

Demonstrators seeking change in immigration policy march on May Day in Los Angeles, California, May 01, 2013. Some 2,000 demonstrators marched in May Day rallies calling for immigration reform, a key issue just north of the US-Mexican border. JOE KLAMAR/AFP/Getty Images ( 519401388 )