Presidential candidates make last-minute push through state before Iowa Caucus voting kicks off.
Iowa Caucus Day 2016
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U.S. Republican presidential candidate Marco Rubio greets patrons at a restaurant in Clive, Iowa. Feb. 1, 2016.
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Republican presidential candidate Donald Trump speaks during a campaign event in Waterloo, Iowa, Feb. 1, 2016.
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Democratic presidential candidate Hillary Clinton hugs her husband, former President Bill Clinton, and daughter, Chelsea Clinton, during a rally at the Abraham Lincoln High School in Des Moines, Iowa, Jan. 31, 2016.
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U.S. Republican presidential candidate Mike Huckabee (second from left) prays before lunch with supporters at Drake Diner in Des Moines, Iowa. Feb. 1, 2016.