If President Biden wants to keep running, he will remain the Democratic nominee. Anyone who thinks otherwise does not know how the party operates, nor the nature of the office involved.
Yes, he had an off night. But if that were one of his best moments, he would still be the right choice. HIs opponent is a bigot, a narcissist, a fool, and a non-stop liar. He appointed the Dobbs majority. He thinks Pledge is a vaccine. He banned trans people from the military.
Biden has to win.