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Demonstrators rally for better wages outside a McDonald's restaurant in Chicago, Thursday, Dec., 5, 2013. (AP Photo/Paul Beaty) ( Fast Food Strikes )

A protester holds up a placard reading 'fair wages' as fast food workers and union members demonstrate calling for an increase in the minimum hourly wage to 15 US dollars and the right of workers to join unions, in New York, USA, 05 December 2013. EPA/PETER FOLEY ( USA FAST FOOD WORKERS PROTEST )

Security guards grab freelance photojournalist Kristoffer Tripplaar to stop him from photographing a protest at a McDonald's restaurant inside the Smithsonian's National Air and Space Museum in Washington, Thursday, Dec. 5, 2013.=(AP Photo/Charles Dharapak) ( Fast Food Protests )

Protesters shout slogans as workers and union members demonstrate calling for an increase in the minimum hourly wage to 15 US dollars and the right of workers to join unions, outside a McDonald's restaurant in New York, USA, 05 December 2013. EPA/PETER FOLEY ( USA FAST FOOD WORKERS PROTEST )

Protesters rally outside of a Wendy's in support of raising fast food wages from $7.25 per hour to $15.00 per hour on December 5, 2013 in the Brooklyn borough of New York City. A growing number of fast food workers in the United States have been staging protests outside restaurants, calling for a raise in wages, claiming it is impossible to live resonably while earning minimum wage. (Photo by Andrew Burton/Getty Images) ( 453790573 )

Protesters rally outside of a Wendy's in support of raising fast food wages from $7.25 per hour to $15.00 per hour on December 5, 2013 in the Brooklyn borough of New York City. (Photo by Andrew Burton/Getty Images) ( 453790575 )

Fast food workers and union members demonstrate calling for an increase in the minimum hourly wage to 15 US dollars and the right of workers to join unions, in New York, USA, 05 December 2013. EPA/PETER FOLEY ( USA FAST FOOD WORKERS PROTEST )

Kendall Fells (C), organizing director of the Fast Food Forward campaign in New York, demonstrates with fast food workers and union members calling for an increase in the minimum hourly wage to 15 US dollars and the right of workers to join unions, in New York, USA, 05 December 2013. EPA/PETER FOLEY ( USA FAST FOOD WORKERS PROTEST )

Protestors chant outside a Burger King restaurant during a protest for a raise in the minimum wage in Charlotte, N.C., Thursday, Dec. 5, 2013. Fast food workers across the country walked off their jobs to fight for a $15 an hour wage. (AP Photo/Chuck Burton) ( Fast Food Protests )

Protesters rally for better wages inside a Wendy's restaurant in Detroit Thursday, Dec. 5, 2013. (AP Photo/Paul Sancya) ( Fast Food Protests )

Cary Davis drops a load of protest signs in preparation for a day-long march in support of fast-food workers Thursday, Dec. 5, 2013, in SeaTac, Wash. Demonstrators planned an eight-hour march Thursday, part of a nationwide-protest for higher wages. Workers, activists and community supporters met in in SeaTac and expected to continue to Seattle City hall, a 12-mile journey. (AP Photo/Elaine Thompson) ( Fast Food Protests Wash )

Protesters rally for better wages at a Wendy's restaurant in Detroit Thursday, Dec. 5, 2013. (AP Photo/Paul Sancya) ( Fast Food Protests )

Aaron Sherman, of Renton, Wash., chants with other protesters as they begin a day-long march in support of fast-food workers Thursday, Dec. 5, 2013, in SeaTac, Wash. (AP Photo/Elaine Thompson) ( Fast Food Protests Wash )

Protesters rally for better wages at a Wendy's restaurant in Detroit Thursday, Dec. 5, 2013. (AP Photo/Paul Sancya) ( Fast Food Protests )

Activists shout slogans about the minimum wage during a protest at a McDonald's restaurant inside the Smithsonian's National Air and Space Museum in Washington, Thursday, Dec. 5, 2013. Fast food workers and labor organizers are marching, waving signs, and chanting in cities across the country amid a push for higher wages. (AP Photo/Charles Dharapak) ( Fast Food Protests )

Sun Benjamin, a home health care worker, looks out from under a cap advocating a $15 minimum wage as she prepares to walk with other protesters on a day-long march in support of fast-food workers Thursday, Dec. 5, 2013, in SeaTac, Wash. (AP Photo/Elaine Thompson) ( APTOPIX Fast Food Protests Wash )

Low wage workers wearing Santa hats join with supporters of an increase in the minimum wage during a protest outside the Air and Space Museum December 5, 2013 in Washington, DC. Supporters of creating a "living wage" were joined by employees of the McDonald's restaurant inside the museum and members of the Congressional Progressive Caucus, in calling for higher wages for those employed at wages of $8.25 an hour. (Photo by Win McNamee/Getty Images) ( 453776777 )

Low wage workers wearing Santa hats join with supporters of an increase in the minimum wage during a protest outside the Air and Space Museum December 5, 2013 in Washington, DC. (Photo by Win McNamee/Getty Images) ( 453776849 )

A bus driver shouts at low wage workers and supporters of an increase in the minimum wage as they block Independence Avenue during a protest outside the Air and Space Museum December 5, 2013 in Washington, DC. (Photo by Win McNamee/Getty Images) ( 453777127 )

Demonstrators demanding an increase in pay for fast-food and retail workers protest outside a Sears store in the Loop on December 5, 2013 in Chicago, Illinois. (Photo by Scott Olson/Getty Images) ( 453785493 )

Protesters rally outside of a Wendy's in support of raising fast food wages from $7.25 per hour to $15.00 per hour on December 5, 2013 in the Brooklyn borough of New York City. (Photo by Andrew Burton/Getty Images) ( 453790555 )

Demonstrators march during a protest outside a McDonald's restaurant located inside of the Smithsonian Air and Space Museum as part of a nationwide protest of fast food workers December 5, 2013 in Washington, DC. AFP PHOTO / Karen BLEIER/AFP/Getty Images ( 525204486 )

Demonstrators demanding an increase in pay for fast-food and retail workers protest in the Loop on December 5, 2013 in Chicago, Illinois. (Photo by Scott Olson/Getty Images) ( 453785511 )

Demonstrators demanding an increase in pay for fast-food and retail workers protest in the Loop on December 5, 2013 in Chicago, Illinois. (Photo by Scott Olson/Getty Images) ( 453785517 )

Protesters rally outside of a Wendy's in support of raising fast food wages from $7.25 per hour to $15.00 per hour on December 5, 2013 in the Brooklyn borough of New York City. (Photo by Andrew Burton/Getty Images) ( 453790559 )

Protesters rally outside of a Wendy's in support of raising fast food wages from $7.25 per hour to $15.00 per hour on December 5, 2013 in the Brooklyn borough of New York City. (Photo by Andrew Burton/Getty Images) ( 453790561 )

Protesters rally outside of a Wendy's in support of raising fast food wages from $7.25 per hour to $15.00 per hour on December 5, 2013 in the Brooklyn borough of New York City. (Photo by Andrew Burton/Getty Images) ( 453790567 )

Activists, holding posters of President Barack Obama, momentarily block Independence Avenue in Washington, Thursday, Dec. 5, 2013, as they protest the minimum wage outside a McDonald's restaurant at the Smithsonian's National Air and Space Museum in Washington, Thursday, Dec. 5, 2013. (AP Photo/Charles Dharapak) ( Fast Food Protests )

Pedro Rodriguez, right, talks with Andrus Reyes as they participate in a demonstration on a Burger King parking lot as part of a nationwide protest supporting higher wages for workers in the fast-food industry and other minimum wage jobs in Boston, Thursday, Dec. 5, 2013. Rodriguez was once an employee of this Burger King restaurant before being "let go" and Reyes works for Local 32 VJ, the union who represents workers hired to clean the restaurant they are protesting. (AP Photo/Stephan Savoia) ( Fast Food Protests )

Protesters rally for better wages at a Wendy's restaurant in Detroit Thursday, Dec. 5, 2013. (AP Photo/Paul Sancya) ( Fast Food Protests )

Protester Austin Prude holds a sign during a rally for better wages at a Wendy's in Detroit Thursday, Dec. 5, 2013. (AP Photo/Paul Sancya) ( Fast Food Protests )

Demonstrators rally for better wages outside a McDonald's restaurant in Chicago, Thursday, Dec. 5, 2013. (AP Photo/Paul Beaty) ( APTOPIX Fast Food Strikes )

Protesters rally for better wages at a Wendy's restaurant in Detroit Thursday, Dec. 5, 2013. (AP Photo/Paul Sancya) ( Fast Food Protests )

Tremaine Tribble, of Charlotte, N.C., leads a chant inside a Burger King restaurant during a protest for a raise in the minimum wage in Charlotte, N.C., Thursday, Dec. 5, 2013. (AP Photo/Chuck Burton) ( Fast Food Strike )

Demonstrators rally for better wages outside a McDonald's restaurant in Chicago, Thursday, Dec. 5, 2013. (AP Photo/Paul Beaty) ( APTOPIX Fast Food Strikes )

Protesters begin a day-long march in support of fast-food workers Thursday, Dec. 5, 2013, in SeaTac, Wash. (AP Photo/Elaine Thompson) ( Fast Food Protests Wash )

Protesters, for higher minimum wages, wave to passing motorists while picketing in front of a McDonald's restaurant in Erie, Pa., on Thursday, Dec. 5, 2013. The protest was part of a national campaign to increase the minimum wage. (AP Photo/Erie Times-News, Christopher Millette) ( Fast Food Protest )

Protestors chant outside a Burger King restaurant during a protest for a raise in the minimum wage in Charlotte, N.C., Thursday, Dec. 5, 2013. Fast food workers across the country walked off their jobs to fight for a $15 an hour wage. (AP Photo/Chuck Burton) ( Fast-food Protests )

Protesters protest for higher wages outside a McDonalds restaurant in Chicago, Thursday, Dec., 5, 2013. (AP Photo/Paul Beaty) ( Fast Food Strikes )

Protesters rally for better wages at a Wendy's in Detroit Thursday, Dec. 5, 2013. (AP Photo/Paul Sancya) ( Fast Food Protests )

Demonstrators outside a McDonald's restaurant near New York's Times Square as part of a nationwide protest of fast food workers December 5, 2013. AFP PHOTO/Stan HONDA/AFP/Getty Images ( 525199060 )

Demonstrators near a McDonald's restaurant outside of the Smithsonian Air and Space Museum as part of a nationwide protest of fast food workers December 5, 2013 in Washington, DC. AFP PHOTO / Karen BLEIER/AFP/Getty Images ( 525204121 )

A demonstrator stands on a poster of US President Barack Obama during a protest outside a McDonald's restaurant located inside of the Smithsonian Air and Space Museum as part of a nationwide protest of fast food workers December 5, 2013 in Washington, DC. AFP PHOTO / Karen BLEIER/AFP/Getty Images ( 525204494 )