Iowa Caucus Day 2016

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.

Democratic presidential candidate Hillary Clinton takes photos with workers at her campaign office in Des Moines, Iowa, Feb. 1, 2016.

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.

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.

U.S. Republican presidential candidate Marco Rubio greets patrons at a restaurant in Clive, Iowa. Feb. 1, 2016.

Republican presidential candidate Donald Trump speaks during a campaign event in Waterloo, Iowa, Feb. 1, 2016.

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.

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.

Republican presidential candidate, Sen. Ted Cruz, R-Texas, talks to supporters after a campaign event at Iowa State Fairgrounds in Des Moines, Iowa, Feb. 1, 2016.