Fun fact:
Arizona law actually stipulates that special appointments like a vacant Senate seat must go to someone from the same party as the person who vacated the seat. So even if AZ had a Republican gov, the seat would still have to be appointed to a Democrat.
Under Arizona law, the person appointed to Kelly’s vacant seat would serve out the remainder of his term. That means they’d have two years to ‘prove’ themselves to voters before having to run for the seat in 2026. I think that’s a reasonable amount of time, especially if governor chooses a strong replacement.