A source revealed that Biden had a private conversation with a colleague, in which he expressed concern about his debate performance. He also apparently expressed concern about his candidacy.
This conversation wasn't meant to be revealed; but it was. Or maybe this is one of those situations where stuff is strategically leaked as a way to test the waters.
So the cat is out of the bag. If this cat is like mine are, it will be hard to predict what happens next. Stay tuned.