actually, this is the irony that you're probably missing:

it's actually trump that needs minority voters to win in the sun belt.

and, it's biden that needs to maintain support amongst older white voters in the rust belt.

there's some encouraging polling in ohio that is at least consistent, even if i'm skeptical about it. older white people seem to like joe biden - even if he doesn't represent them, and a vote for him is more or less against their self-interest.

so, it's sort of flipped over.

and, in the sense that it's a popularity contest rather than a political contest, biden is well positioned - for now.