Hillary Clinton, Bill Clinton and daughter Chelsea attend "Caucus Night Victory Party" in Des Moines, Iowa

Supporters of former secretary of state and Senator Hillary Clinton, 2016 Democratic presidential candidate, cheer prior to the arrival of Clinton during a "Caucus Night Victory Party", February 1, 2016, in Des Moines, Iowa. Clinton claimed a narrow win over Vermont Sen. Bernie Sanders, in Iowa's first-in-the-nation caucuses. Photo by Mike Theiler/UPI