I just realized what it is that the Democrats have been reminding me of lately. I couldn't put my finger on it.
The Democrats in 2016 threw a full-on toddler tantrum over Trump's election. Like, it was absolutely massive. And then...2020 was a reversal of fortunes (opinions differ on how that was achieved, I'll leave it to the expert spergs here about election chaos to duke it out).
Ever respond to a toddler's tantrum by just basically immediately giving in and saying "yes, baby, just please for the love of god stay quiet for maybe ten minutes, I'm doing something so important I can't possibly impress it upon you"?
Maybe you'll be the "lucky" parent whose child merely learns they can manipulate you with an emotional display. But depending on the toddler's character, you may find that even once they are given the thing they claimed to desire more than life itself, upon being given their Holy Grail, they will throw it to the ground and thrash around. It's actually luckier if you get this kind of kid, because then giving in is a mistake you'll only make once (rather than spoiling a kid by assenting to unreasonable demands whenever shit gets rough).
The Democrats are this latter kind of toddler. "Vote Biden and stuff will go back to normal, but you have to vote Biden, re-electing Trump will prolong our tantrum FOREVER!"
The Democratic establishment had already been preparing and laying the groundwork for a full racially-based anti-vaccine movement and campaign if Trump had been re-elected, because the last thing they wanted was a successful rollout of the fastest vaccines ever made for Donald J Trump. It would have been catastrophe. People might have given him a third term, especially since at the point a certain percentage of the country got it, Trump's style would have been to reopen everything, stop testing centers and daily reporting, and declare victory. Honestly, I think most people would be happier with that (after a couple of months of hardcore covidians pouting and swearing they won't ever participate in society, then doing it within a year) than what we've got now.
No matter what the outcome of the election, the Democratic Party was going to have a barely-controlled mass of protesting rebels with a very flexible cause. What exactly was the advantage of this presidency supposed to be, if normalcy's not even on the table in most of the country?