It honestly seems to me that Obama voters and historic dem voters that were "a lock" for Hilary voted for Trump.
It seems that the margin in MI is now less than 1k votes? That's nuts. The margin in PA and WI are also quite small.
If racists were a real factor now, they were certainly a factor in 08 and 12, when a legit black man Kenyan muslim non-American was running. But the very same people in the very same counties in MI, WI, PA that voted for that black man muslim Kenyan also voted for Donald Trump.
Did racists vote for Donald Trump? absolutely. did he "draw them out of the woodwork" like many argued? His vote total was lower than McCain's and Romney's, so I don't think they are a factor in the end. They didn't flip this election one bit. Obama and assumed Hilary voters (pretty much Bernie supporters in the primary) did, though.