The Brief Michigan’s primary election is tomorrow, Tuesday, Aug. 4. The Democratic Senate race is gaining national attention and has national implications for the balance of power in Congress next year. Michigan’s primary election is tomorrow, Tuesday, Aug. 4. Here’s what you need to know:Michigan’s primary electionBig picture view:The primary election is Tuesday, Aug. 4. Republicans haven’t won a U.S. Senate seat in Michigan since 1994, though Rogers came within 20,000 votes of doing so in 2024.