Wisconsin

Keeping accurate and current voter registration records is useful. Voter fraud is close to non-existent, probably because if you register in multiple locations, you'll definitely be identified. Knowing where to send absentee ballots is great, too.

Wisconsin has same-day voter registration, so it's at worst a mild inconvenience for anyone whose registration was purged, hasn't moved to a new place, and they still want to vote in an upcoming election.