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UNITED STATES - FEB 1. - Democratic presidential candidate Sen. Bernie Sanders, I-Vt., speaks at his caucus night rally at the Holiday Inn Des Moines Airport and Conference Center, on Monday, Feb. 1, 2016 in Des Moines, Iowa. (Photo By Al Drago/CQ Roll Call)

UNITED STATES - FEB 1. - Democratic presidential candidate Sen. Bernie Sanders, I-Vt., speaks at his caucus night rally at the Holiday Inn Des Moines Airport and Conference Center, on Monday, Feb. 1, 2016 in Des Moines, Iowa. (Photo By Al Drago/CQ Roll Call)

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