One sad observation is this. If I tell my Democrat acquaintances tomorrow that I think Trump did great on the debate and I’m voting for him, they’ll just freeze me out and pretend I don’t exist for the foreseeable future.
But if I tell my Republican acquaintances tomorrow that I think Biden did great on the debate and I’m voting for him, the response will be, “ah, interesting! Which policy ideas did you find convincing? Why? Wanna go have lunch and talk about it?”
And it’s not because the latter are better than the former or anything like that. It’s because Democrats believe that their position is morally superior. It’s the issue not of politics but of morality. And nobody wants to compromise on morality.