wouldn't be surprised if Whitmer won by less than 10%. I believe she has this and will win, but she is unpopular with a large amount of people, she is polarizing, I could see a 53-45 win for her, like in 2018.
Whitmer is indeed polarizing and part of that is owed to her ascent to national politics with the strict lockdowns and speculation over Biden’s running mate. It’s telling that out of all the democratic governors in the country, she was the one who was the target of a kidnapping plot by right wing terrorists. Considering how little national republicans have decided to invest in the race, Whitmer is favored, but certainly not by a safe or likely margin in a state that’s to the right of the nation as a whole.