 Right now, Biden has been adamant that he will not drop out. It's almost as if he's reverting to the origin story of his long political career, which is he's always counted out and he always proves his critics wrong. The problem is that every Plan B has problems. The easiest one to imagine is that Biden releases his delegates and tells them to vote for Vice President Harris. After all, it's the Biden-Harris campaign. She can inherit his money and infrastructure very easily.