The biggest spotlight is on Michigan, where the high-stakes fight between the left-wing and the center-left establishment for the future of the Democratic Party is front-and-center. But taking top billing is Michigan's divisive and expensive Democratic Senate primary, which is seen as the biggest stage to date in the fierce fight for the future of the Democratic Party. Gretchen Whitmer, and longtime Senate Democratic Leader Sen. Chuck Schumer. "Let's make sure that anyone but Mike Rogers gets to the United States Senate," Stevens told reporters on Sunday. "After the primary, you're going to see a united Democratic Party.