UPI Pictures of the Year 2016 -- U.S. PRESIDENTIAL ELECTION
Supporters of former secretary of state and Senator Hillary Clinton, 2016 Democratic presidential candidate, listen to remarks at Lincoln High School during a campaign event on the eve of the Iowa caucuses, January 31, 2016, in Des Moines, Iowa. Clinton is facing a tough race with Vermont Sen. Bernie Sanders, ahead of Iowa's first-in-the-nation caucuses February 1. Photo by Mike Theiler/UPI
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