Oklahoma has been under republican control since forever.
How did it accumulate 450,000 incorrect voter registrations in the first place?
It sounds to me like the GOP can't govern.
P.S. Being registered doesn't mean any of these people actually cast a vote in any recent elections.
P.P.S. Voter fraud is vanishingly rare, despite what the fear mongers would have you believe.
https://www.brennancenter.org/sites/default/files/analysis/Briefing_Memo_Debunking_Voter_Fraud_Myth.pdf