Voters in SeaTac, Wash., have narrowly approved a measure raising the minimum wage at its international airport, officials say. But the initiative faces several challenges, including a recount. Elaine Thompson/AP hide caption

itoggle caption Elaine Thompson/AP

New York City Council speaker and then-mayoral candidate Christine Quinn speaks at a fast-food workers' protest outside a McDonald's in New York in August. A nationwide movement is calling for raising the minimum hourly wage for fast-food workers to $15. Richard Drew/AP hide caption

itoggle caption Richard Drew/AP

McDonald's USA President Jeff Stratton responds to an employee who burst into an event. YouTube screengrab hide caption

itoggle caption YouTube screengrab

Outside a Taco Bell restaurant in Warren, Mich., early Thursday, supporters of the push by fast-food workers to raise the minimum wage were marching. Jessica J. Trevino /MCT/Landov hide caption

itoggle caption Jessica J. Trevino /MCT/Landov

People gathered outside a Wendy's restaurant in New York City on Monday as part of a one-day strike calling for higher wages for fast-food workers. Justin Lane/EPA/Landov hide caption

itoggle caption Justin Lane/EPA/Landov