I'm surprised Trump is doing this well among Republicans, but if this is a recurring theme in many battleground states then it bodes well for Trump even if he doesn't win Michigan.
“The results reveal Clinton’s edge with female voters decreased, as well as her support from Democrats. “For the first time, Clinton is weaker with Democrats (89% in the four-way) than Trump is with Republicans (92% in the four-way). Trump continues to have a strong lead with Independents (50%-18%),” notes the poll’s press release.”
I’d have to conclude that Trump is gonna clean her clock in Michigan if she’s getting 89% of democrats and is still at only 41% in this poll, while Trump gets 92% republicans and is up 32% in independents.