In the coming days, it may well be that President Biden will decide that for the sake of having a chance at another Democratic White House, for the sake of down-ballot Democratic races, for the sake of democracy itself, it’s time to walk away. For many of us, I suspect, this seemed the best outcome following his famously disastrous debate performance on June 27th in Georgia. Though, if he goes, it will not be because he had one bad debate; it will be because everything he did after the debate to prove he was still capable proved just the opposite. He may surprise us by refusing to heed calls f…