I think The dems were worried (or know) that Biden is going to be taken out with the bribery as VP stuff. Basically a done deal, so they circled the wagons and got Biden the nomination in order to run with the, "You can't take out a candidate", defense.
They're only hope now is to have some kind of medical incident with Biden so they can ramp up the sympathy card whilst replacing him. Can't investigate someone who has medical issues. Harvey Weinstein trial on steroids.
The Biden push started when Graham started talking about calling in Biden and his kid. That was the trigger, I think.
The dems also took out AOC and the squad (friendly fire?), who are joined at the hip to a sinking Bernie. The squad's endorsement and/or support for any candidate is the kiss of death at this point.
So what do you do? I think POTUS blows the whole fucking thing up anyway. Two birds with one stone, Biden gang and the Squad gang are taken out of the game.