Presidential candidates make last-minute push through state before Iowa Caucus voting kicks off.
Iowa Caucus Day 2016
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Republican presidential candidate Donald Trump, accompanied by (from second from left) wife, Melania; daughter, Ivanka; her husband, Jared Kushner; speaks during a campaign event in Waterloo, Iowa, Feb. 1, 2016.
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Democratic presidential candidate Hillary Clinton takes photos with workers at her campaign office in Des Moines, Iowa, Feb. 1, 2016.
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Republican presidential candidate, Sen. Ted Cruz, R-Texas, carries his daughter Caroline, 7, as he arrives at Green County Community Center for a campaign event in Jefferson, Iowa, Feb. 1, 2016.
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U.S. Democratic presidential candidate Bernie Sanders speaks to reporters from his bus outside his campaign's Iowa headquarters in Des Moines, Iowa, Feb. 1, 2016.