Democratic Presidential Candidate Bernie Sanders Holds Campaign Event In Mason City [Getty Images]

MASON CITY, IA - JANUARY 27: Democratic presidential candidate Sen. Bernie Sanders (I-VT) speaks at a campaign rally at Music Man Square on January 27, 2016 in Mason City, Iowa. The Democratic and Republican Iowa Caucuses, the first step in nominating a presidential candidate from each party, will take place on February 1. (Photo by Brendan Hoffman/Getty Images)

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