Democrats hit the campaign trail throughout the Wolverine State (15 images)

Supporters listen as democratic presidential candidate Bernie Sanders speaks at a campaign rally in Dearborn, Michigan, March 7, 2016. Photo by Molly Riley/UPI

Democratic presidential candidate Hillary Clinton greets supporters after speaking at Detroit Manufacturing Systems in Detroit, Michigan, March 4, 2016. Photo by Molly Riley/UPI

Democratic presidential candidate Sen. Bernie Sanders listens during a press conference where he was endorsed by former U.S. Senator and Representative Don W. Riegle Jr., of Michigan, prior to the Democratic presidential primary debate in Flint, Michigan, March 6, 2016. Photo by Molly Riley/UPI

Democratic presidential candidate Hillary Clinton speaks at a campaign rally at the Charles H. Wright Museum of African American History in Detroit, Michigan, March 7, 2016. Photo by Molly Riley/UPI