Like the geriatric lady in the old TV commercial, Dementia Joe Biden has fallen and he can’t get up. Of course, in that instantly viral video Friday, after the three tumbles going up (not down) the stairs, “President” did finally manage, unlike the old lady, to limp unsteadily onto Air Force One. But perhaps even more disturbing than the falls or his doddering, unsteady walk from Marine One to the Boeing 747 was what happened when he reached those treacherous boarding stairs on the tarmac. From the back, you could see him look down, apparently in either confusion or trepidation,...