I think the thought process is that Trump will definitely win now no matter who runs against him, so it’s better to let Joe go down to defeat than getting the stink of loserdom on any other Democrat who could’ve taken his place. They’re throwing in the towel and letting Biden lose, which says a lot about their seriousness about “the most important election in our lifetimes.”
The shit is that if Sanders either got the nomination or grew a pair of balls big enough so he would run as an independent, he would beat both in a landslide
Bingo. Trump’s fist pump in the air sealed the deal. Every Democrat is now going to coax Biden into eating that giant L on election day while preparing for 2028.