 It should be remembered that Mr. Biden challenged Mr. Trump to this verbal duel. He set the rules. He insisted on a date months earlier than any previous general election debate. And as has been said by many, perhaps the fix was in with that. That's why CNN and the Dems figured they could get him out. He understood that he needed to address longstanding public concerns about his mental acuity and that he needed to do so as soon as possible. The truth Mr. Biden needs to confront now is that he failed his own test.