How much harder is sweeping three correlated states than winning one?
Core argument: Biden wins all three of Michigan, Wisconsin, and Pennsylvania in only 32% of the model's simulations, versus 54% for winning at least one of them.
If Biden loses Georgia, Arizona, and Nevada — and he trails badly in each — he’ll need to win all three of Michigan, Wisconsin, and Pennsylvania and not just one of them. Even though these states are pretty heavily correlated, they aren’t perfectly correlated. Winning several different correlated bets is still hard. (Just ask the DraftKings how it makes so much money on same-game parlays.) And these states do have some differences with one another: Wisconsin is more rural, for instance, and Michigan has the largest Arab/Muslim/Palestinian population. In our simulations, Biden wins at least one of these states 54% of the time. But he wins all three of them in only 32% of simulations. This is the sort of precision that a model can provide that your intuition really can’t.

