We need to clean up all state voter databases. They are outdated. They contain voters who’ve moved, died, vacant addresses or illegals.
After an election, the voter data should be destroyed. Every two years, the federal government should require citizens to reregister to vote with a social security number and full address.
The federal government will split and provide registration data to each state/county eliminating duplicates between states. This would also eliminate any deceased and illegal voters from being able to vote.