I thought Biden probably did not break 50% of the white vote in any precinct in Mississippi, but then I found Hinds 17 where Biden clearly got nearly 70% of the white vote. He may not have broken 50% anywhere else (perhaps Hinds 8). I'm not sure what makes Hinds 17 so unique even within Hinds County.
In South Dakota, Biden clearly got over 60% of the white vote in at least Minnehaha 5-8 and possibly 5-4 as well, but, more significantly, he easily broke 60% and likely broke 70% of the white vote or at least came very close in Clay Vermillion Central-1 and 2. Vermillion Central-2 is the University of South Dakota precinct while Vermillion Central-1 is a residential area just east of the city center.
I'm not super familiar with Jackson's trends, but is it possible that the racial demographics changed dramatically from the time of the precinct racial data (maybe the 2010 census) to the 2020 election? That would explain what seems to be a major outlier.
