Biden v. Trump: 54%-46%
Klobuchar v. Trump: 53%-47%
Sanders v. Trump: 52%-47%
Harris v. Trump: 51%-49%
Warren v. Trump:51%-49%
Statewide, President Trump has a 52% disapproval and 40% approval (registered voters, March 7-10, mm, n=743, +/- 3.5%). More concerning for the President is that 56% of Michigan voters said they are unlikely to vote for Trump (of which 52% are very unlikely to vote for him); 44% of voters say they are likely to vote for Trump (37% are very likely).
https://emersonpolling.reportablenews.com/pr/michigan-2020-primary-biden-with-strong-lead-but-sanders-waiting-in-the-wings