A driver's license isn't proof of residence, as you might have moved since you got it. When you register to vote you need to prove you have the right to. When y

A driver's license isn't proof of residence, as you might have moved since you got it. When you register to vote you need to prove you have the right to. When you show up at the polls, you need to prove you're the person who registered. ID is one way. Another is by signature, does your signature match the one you used when you registered. A third is that the poll workers know you by sight, which used to be common in small towns. People voting multiple times isn't really a risk, because it's incredibly stupid. It's a felony, so if you get caught, you go to jail. But if you get away with it, you've flipped one vote, and even a very close election isn't going to be settled by a couple of votes. There were a very small handful of people who got caught voting twice in the 2020 election, or casting someone else's ballot: two or three in Georgia and in Pennsylvania. Most voted twice for Trump.