regarding michigan.

2016 results:

21% black turnout - 68% clinton, 28% sanders

70% white turnout - 56% sanders, 42% clinton

2020 results:

18% black turnout - 66% biden, 29% sanders

72% white turnout - 51% biden, 45% sanders

when you're talking about 3-4 points, that's the margin. so, maybe black turnout was down a little, and maybe white turnout was up a bit.....but it's too close to really state as much.

and, the percentage of black voters is almost identical.

but, the white vote flipped over. that's what happened.