 Because if you have the no-mo and momentum stops like it is for Biden right now, where there is zero, there's nothing going right for him, nothing. He can't do anything. Stadium rallies, interviews, meet and greets, grip and grins, none of it. NATO, he's talking about porking some dude's wife or something. He can't do anything right. When you hit no-mo, you start losing voters who don't show up.