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Merely last name and DOB brings up a fairly unique value. This is what Walgreens, and others, now use instead of SSN.

There was an earlier HN item about how DOB, gender, and Zip identifies 87% of the US population uniquely. No SSN needed in either case.

https://news.ycombinator.com/item?id=2942967

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I would argue that 87% is an unacceptable margin of error given that we are talking about the presidential election.

That margin of error is across the whole country. Vote checking would run over a much smaller area.

It doesn't matter if it's across the whole country because the identification incorporates zipcodes. All ambiguities are local to a single town.

agreed and upvoted.

This would be to find those multi-registered voters. Considering the current system is merely first + lastname, I think either approach above would be superior and without leaking SSN's to yet another government database.

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