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Hillary Clinton, former Secretary of State and 2016 Democratic presidential candidate, speaks during an event in Indianola, Iowa, U.S., on Thursday, Jan. 21, 2016. With less than two weeks before the first ballots of the election are cast in Iowa, Clinton, who promised that she would "work for every vote," is having to do just that. Photographer: Daniel Acker/Bloomberg via Getty Images

Hillary Clinton, former Secretary of State and 2016 Democratic presidential candidate, speaks during an event in Indianola, Iowa, U.S., on Thursday, Jan. 21, 2016. With less than two weeks before the first ballots of the election are cast in Iowa, Clinton, who promised that she would "work for every vote," is having to do just that. Photographer: Daniel Acker/Bloomberg via Getty Images