They will just nominate whoever they want installed bypassing any votes from the citizens. "Any vote for Biden" if his name is on ballot will count as a vote for "Their installed person". They did something like that in the last few years where, the Dem candidate died and instead of allowing the citizens to vote on a new one, they installed who they wanted and said pretty much -A vote for the deceased person will be considered a vote for the person we installed without you all voting to have that person on the ballot in the first place.