Biden today is like Andre the Giant in the old Battle Royale matches in the 70's. He's the most known elephant in the room. With Andre, getting 4-12 guys ganged up on him made sense. If you got to 5 guys and Andre was one of them, he was going to win. So virtually EVERYONE worked to toss him out of the ring.
Same with Joe. He's the most chance to win. But each of the other contenders can't be the TOP DOG without taking out Joe first. Collectively.
Amazingly they'll criticize him for not being liberal enough. It will make him rush FURTHER Left. On top of that they'll have his plagiarism and fondling to go after. He'll be taken down like "a-frican" buffalo by a pride of lions.