The USA is rare among democracies in electing a President by a formula different from one-person-one-vote.
One well-known inequity is that small states get more electoral votes per inhabitant. I think of this as a linear effect, which, all else equal, gives a Wyoming resident a 3.5 times better chance of determining the President than a Californian.
The other best-known inequity is the winner-takes-all system in most states, which means that a few swing states end up determining the winner. This is a vastly greater injustice, for it is exponential. Thanks to the laws of statistics, the chance that a Californian might determine the President is in a precise sense exponentially small because of the exp(-x^2) shape of the normal distribution. Likewise for a Wyomingite. This biggest problem of American democracy is thus a corollary of the Central Limit Theorem.
[22 September 2024]

