People wait in line outside the Supreme Court in Feb. 2013 to listen to oral arguments in the Shelby County, Ala., v. Holder voting rights case. Evan Vucci/AP hide caption

itoggle caption Evan Vucci/AP

Election Day volunteer Vicki Groff places a sign to direct voters to a polling station at Kenilworth School in Phoenix in 2012. Jonathan Gibby/Getty Images hide caption

itoggle caption Jonathan Gibby/Getty Images