I was wondering about that minor detail… Presumably he’ll find someone willing to do this for him; wouldn’t surprise me that they’ll even pay him to to the work for him. But when he (probably) decides not to run after all (e.g. “never mind, you don’t even deserve me as President”) presumably that money’s supposed to be rolled forward to the next candidate(s) – I’m guessing he’ll probably just keep it or roll it into his “PAC.”
At the same time, I don’t recall that Biden’s approval numbers, at their lowest, have ever dipped down to Trump’s at their highest. Which, yeah, ought to be a pretty low bar. But Biden is far from being the unpopular and horrible POTUS that the 2020 campaign would have people believe. (Again, a low bar.) FWIW.