Trump. Not only is Biden going to lose, he's trying to lose.
Why would he want Trump to win?
He's flip-flopping on Israel/Gaza instead of taking a position and sticking to it. It might be a lose-lose situation, but he's managing to infuriate both sides. As to why he wants Trump to win, I'm not entirely sure - that's the main hole. Maybe he doesn't want to deliver what his base wants. But if he didn't want to be President anymore, he shouldn't have run for reelection.
He's running because his handlers want him to.