CONFUSED AND incoherent, Joe Biden’s performance in the first presidential debate on June 27th was excruciating for his supporters. But the ordeal did not end when the debate did. Minutes later Jill Biden, who had helped her shuffling husband off the stage, tried to make things better and made them worse. “You did such a great job!” she yelled at the dazed 81-year-old, before a crowd and TV cameras. “You answered every question!”