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He has dug in because he family is telling him it's all fine, apparently.  I think his wife likes being FL, the status, the apparent importance, etc.  He could pardon Hunter on the way out, I don't think that's a factor.

In my view, Joe has midstage dementia.  He probably does go in and out, but even when he's "in" he's not anything like 100%.  He can sound "OK" if everything is highly controlled and he's in an "in" phase.  This interview tonight will be as controlled as any can be, but it will depend a lot on whether Joe is mostly there, or not, and no one can manage that.  It could be another F-ing disaster.

At best, he will seem fairly "OK" and that would mean he stays in the race.

Yup, that's what I meant by "as controlled as it can be".  But Joe can still have a bad day, and the spotlight is on him, any gaffe, any misstep, any  trailing off, any "We beat Medicare", and, well, it would be a disaster.  Even if he holds it together, folks will still be unconvinced except his partisans.

why would Biden dig in and fight this

perhaps, he's waiting for a few to offer him a fistful of dollars to drop out?

He can't really enjoy the job or schedule, or believe he's really about to accomplish anything of substance
maybe so he can pardon his son?

I would assume he thinks he is the best chance for a Democrat to win, which might not be incorrect (not a great field there). And thus the best chance to advance the beliefs and ideals that he has basically works for his whole life.

some people shrink from a likely. Some are aggressively confident enough to think they’ll win, even if they won’t.

Live updates: Biden ABC News interview; 2024 election news | CNN Politics

"They" are going to up their efforts to have Biden in what could appear to be more unscripted moments and events.  This clearly is an effort to counter the atrocious debate appearance, but I don't think it will work.  I guess they have to try, and then by end of month face reality.

And maybe, my assessment is just wrong and Joe had a cold.

Other than the White House folks, I see very few on social media claiming Joe is fine, mentally, almost zero.  I did see a couple copy and pastes, but those were rare.  The main thing I'm seeing from "liberals" now is something about Project 2025.  One person posted the folks hammering Biden are just bedwetters, which is the  term used in a WH communication as well.

I don't think the "spin" is anywhere near working.  I SUSPECT liberals mostly have their head down hoping this passes and they pick someone else, which is fine with me.

If it was merely a poor debate performance, I would expect all sorts of attempts at his defense, and I'm seeing almost none.  I still can't see how this can be turned around somehow even if Biden goes public and looks "OK".

joe's been like this for years

I would not be surprised if he regularly wets the bed