30 of 50 (or is it 57) governors are Republican. This must be a constituent service item to file this bill.
A counter-proposal: An Amendment modifying life-time tenure for federal judges to make they stand for a retention vote every 4 years (held in the off-year cycle election). This would mitigate the problem of insulating judges from having to run for office, yet would allow the voters to eject a judge who sufficiently offended them with his/her rulings.
Be content to require any judge who reaches reaches the age to 75 to submit to reappointment.