Consider this scenario: An absentee ballot in Wisconsin gets returned with an error, like the voter failing to sign the envelope, but it mistakenly gets counted anyway, because a municipal election worker initially didn’t catch the error when taking the ballot out of the envelope.

Later, perhaps during a recount, a worker catches the error and has to mark that voter as invalid. And now the number of ballots in the counting pile is one greater than the number of valid voters.

The solution? Just pull one random ballot out of the pile and set it aside to not be counted. Now the numbers match up. But someone — it’s impossible to know who — got their valid vote tossed.

It may not seem fair, but it actually happens from time to time in Wisconsin — and almost nowhere else — because of an election law that’s nearly as old as the state. Election officials aren’t crazy about the practice, called a ballot drawdown, and say it is reserved only for extraordinary cases.