Democratic presidential candidate, Sen. Bernie Sanders, I-Vt., speaks during a stop at the United Steelworkers Local 310L union hall, Tuesday, Jan. 26, 2016, in Des Moines, Iowa.
Democratic presidential candidate, Sen. Bernie Sanders, I-Vt., speaks during a stop at the United Steelworkers Local 310L union hall, Tuesday, Jan. 26, 2016, in Des Moines, Iowa. Charlie Neibergall AP
Democratic presidential candidate, Sen. Bernie Sanders, I-Vt., speaks during a stop at the United Steelworkers Local 310L union hall, Tuesday, Jan. 26, 2016, in Des Moines, Iowa. Charlie Neibergall AP