 Well, he's saying that if Joe Biden leaves it open ended, it will be a free for all coming up in the very near future for the Democratic Party. Because someone is standing in the on deck circle doesn't mean they get to step up to the plate. You can always be substituted for when the other team switches pitchers or righty lefty. You can substitute who's going to come up to the plate to match who's best against that new pitcher. If Biden steps down.