Plenty of countries already do, but at least judging from reading about America on HN its much more difficult to do anything like that in America because of distrust in government. You even vote without ID which is extremely weird for the rest of the world.
> You even vote without ID which is extremely weird for the rest of the world.
The system they use actually works pretty well. They have a list of registered voters and when you vote they cross your name off the list. You have no way of knowing who has already voted, so if you give someone else's name you risk their name already being crossed off, and then you may be in for some questioning.
If you want to do something that would actually impact the election results (i.e. vote thousands of times and not just twice) then you would also have to come back in over and over using different names, which creates the obvious potential for the poll workers to recognize you. Avoiding that would require some kind of large conspiracy so that each person doesn't reappear enough times to be recognized or use the same names as one another, which then makes it much more likely that you're caught because one of your co-conspirators turns you in.
So the risk of getting caught is pretty high even without ID, especially if you're doing it with enough scale to really matter. Meanwhile the penalty is typically something like a year in prison per offense, which is a pretty high price to pay for one extra vote.
