Democratic presidential candidate Sen. Bernie Sanders, I-Vt., speaks during a campaign event, Monday, April 4, 2016, in Milwaukee, Wis.
Democratic presidential candidate Sen. Bernie Sanders, I-Vt., speaks during a campaign event, Monday, April 4, 2016, in Milwaukee, Wis. Paul Sancya AP
Democratic presidential candidate Sen. Bernie Sanders, I-Vt., speaks during a campaign event, Monday, April 4, 2016, in Milwaukee, Wis. Paul Sancya AP