@Sweet Square
He does ok with black voters, mostly in line with his numbers among whites, but he does very very badly with southern blacks (and quite badly with southern whites). At least this time, his strongest racial support has been Hispanics.
There is no way he does better with black women. He does worse with women overall this time, much worse compared to 2016 when it wasn't too big a gap. There's no polling separating by both race and gender but it won't make sense in light of the separate race and gender trends.
Unfortunately a lot of primary polling just lumps all non-whites into one group, so it is hard to tell. In
this poll, his strongest recent showing, he has 14% among whites and 25% among non-whites. In
this one, his weakest, he has 13% among whites and 15% non-whites.
However, in
this poll for South Carolina only, which does a better racial breakdown, he has 13% among blacks, 16% among whites, and 20% among hispanics.
The main thing with Bernie's polling is always that age is the strongest determinant, and race/gender/income are usually secondary to it.