The state primary is not expected to be until August of next year, and it is not yet clear what the final field may look like.
A number of the state’s most prominent politicians — including Gov. Gretchen Whitmer, Mayor Mike Duggan of Detroit, Representative Haley Stevens and Pete Buttigieg, the U.S. transportation secretary whose official residence is now in Michigan — have indicated they do not intend to run. On Friday, State Senator Mallory McMorrow, a prominent lawmaker who went viral last year defending L.G.B.T.Q. rights, said she would not run.
Many elected officials and other power players in the state had been waiting to see whether Garlin Gilchrist II, the state’s first Black lieutenant governor, would jump into the race, and some had wanted to support him.
But on Sunday, he wrote on Twitter: “Serving our state in Washington, D.C. would be a great opportunity, but instead I will keep standing tall for Michigan, right here at home, as Lieutenant Governor. The Governor & I have more work to do. I look forward to working with our next US Senator to get it done.”
Some Michigan Democrats have emphasized the importance of Black representation in the primary.
“Michigan has this rich pool of qualified African American candidates, and we have so few that represent us in the Senate,” said former Representative Brenda L. Lawrence, Democrat of Michigan, in an interview on Friday. “We have an opportunity to send a qualified public servant to the Senate, so I just really think it’s important. And I think Michigan has the opportunity to fulfill that.”
She pointed at the time to Mr. Gilchrist and Hill Harper, an actor in the TV series “The Good Doctor,” as potentially strong candidates. She also said she had not “shut the door yet” on her own potential bid.
And there is renewed attention to the intentions of Michigan’s secretary of state, Jocelyn Benson. She has not ruled out a bid, but previously signaled she was more focused on her current job.