Democratic presidential candidates Hillary Rodham Clinton, left, Sen. Bernie Sanders, I-Vt., second from right, and former Maryland Gov. Martin O'Malley, right, stand on stage together at the start of the Iowa Democratic Party's Jefferson-Jackson Dinner, Saturday, Oct. 24, 2015, in Des Moines, Iowa. Iowa Democratic Party chair Andy McGuire, second from left, looks on. Charlie Neibergall AP