It could set a precedent for lame ducks whose successor is of the same party as them. Clinton could maybe resign for Gore in an ATL 2000 election. But I think this would probably just stir the pot when it comes to theories about his health and state of mind. But I don't know why he'd do this, Bush would still have to be sworn in in January, wouldn't he? And Congress isn't going to be in the mindset to be passing large legislation in what is traditionally a more legislatively relaxed period. Honestly there wouldn't be much point to this, as Bush would still have to build his transition team, which wouldn't be as intensive a process given he was the VP to another Republican, but still.