So here's some weirdness from the negative state correlations side of things:
If Biden wins Georgia and North Carolina, he has a 16% chance of winning Mississippi.
If Biden wins Georgia, North Carolina, and Minnesota, he still has a 16% chance of winning Mississippi.
However, if Biden wins Georgia and North Carolina, but loses Minnesota, he suddenly has a 53% chance of winning Mississippi.
This one actually kind of makes sense — if Biden’s winning GA and NC but losing MN, something must have turbocharged black turnout nationwide.