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UNITED STATES - FEB 1. - Democratic presidential candidate Sen. Bernie Sanders, I-Vt., waves as he arrives for 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., waves as he arrives for 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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