Biden is and was a creepy joke. He was never going to be President. He was put out there to pull the narrative away from the communists running and set the stage for a better candidate, one who pretends to be reasonable safe centrist while really being a communist. It worked, now it's time to throw him overboard and that's what they are doing.
I'm still trying to understand why Hillary picked Kaine. How could he possibly have improved her chances of being elected?