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For those unfamiliar, J. Alex Halderman is probably the leading academic researcher on the security of computerized elections (he's in the same UM security research group as Peter Honeyman, Chris Peikert, and Kevin Fu).

The tl;dr for Antrim County seems to be that the county spotted an error in their ballot format a few weeks before the election and got their ballot vendor to generate new ballots, but failed to consistently update all their equipment, so in a bunch of precincts all the Presidential votes got shifted by one candidate. Real votes for Biden were discarded, votes for Trump were recorded for Biden, and votes for Libertarian candidate Jo Jorgenson were recorded for Trump. A small remainder of incorrect votes somehow (I'm not reading carefully, but the paper has it exactly) had to do with miscoding of straight-ticket voting options.

Interestingly, a single discrepancy that apparently Halderman found on his own may have altered the outcome of a ballot initiative in Central Lake, MI, which was decided by one vote.




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