‘...Only potential remedy would be to redo the entire election and police it next time....”
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Redo the entire RUNOFF election and ONLY those who LEGITIMATELY participated in the 6/24 runoff would be eligible to vote. No one who illegally voted on 6/24 or who didn’t vote on 6/24 could vote in the new HONEST, NON-CORRUPT election.
I don’t believe you can exclude any voters who are legitimate voters, no matter if they didn’t vote last time.