> Further, states are individually responsible for determining if someone is probably an eligible voter, and so there’s different processes and checks in place

> Further, states are individually responsible for determining if someone is probably an eligible voter, and so there’s different processes and checks in place depending on the state. It's more fundamental than that: states are individually responsible for determining who the eligible voters are. There are variations from state to state as to the terms of residency in the state, whether felons or people who have been declared mentally incapacitated [0]. That, among other things, causes a substantial difficulty in attempts to (say) conform presidential elections to the national popular vote outcome; one of the functions of the electoral college is to (mostly in a very nonlinear binary fashion) normalize the results by state to the total population rather than simply the enfranchised population (hence the 3/5ths rule being a compromise between "count the slaves" and "don't count the slaves" in the weighting process). [0] https://www.vote.org/voter-registration-rules/ https://www.vote.org/voter-registration-rules/