I think the issue is that you can only be registered to vote in one jurisdiction. So being a citizen isn't enough (though as I understand it, many jurisdictions let you cast a provisional ballot in these situations)
reply> And I was too late to register at the time.
replyThat's a thing pretty much everywhere. Developed countries such as Germany automatically enroll everyone eligible based on the registration data (you gotta register at the local authority after moving), but even we have a deadline if you think you should be eligible but didn't get a voting invitation to sort that out.
Without a real-time, probably national "who has voted & where did they vote" database - how would a "just show up and vote" system block a citizen from voting once in each of multiple jurisdictions?
replyYou can solve that simply by putting all such votes inside signed envelopes, and waiting to count the contents until all the envelopes can be checked for duplicate voter details. In Australia this can be forced on you if you are caught double voting, or you can opt into it if you don't want to appear on the (public) electoral roll (and hence can't be ticked off), or you're voting from outside your electorate (so they don't have a copy of your electorate's roll).
replyHard enough to get a person to vote once. Probably not a big problem.
replyThe big problem is, the folks who count the votes and cheat. They can invent an arbitrary number of votes to swing their guy.
Let's worry about the problems that matter.
SSN? To me this is one of those friction things, why is it hard? Like taxes, I would take an option rather than tallying up just pay a flat $5K fee or something under your expected tax bracket.
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