 There were lots of backs and forths like this, including on topics like Ukraine and abortion. But the main story coming out of the debate seems to be concern about Joe Biden's performance. He seemed to lose his train of thought at points, verbally stumbling. His voice was hoarse, his team said, because he was suffering from a cold. But even those on his own side, Democrats, are concerned. His vice president said he had a slow start. David Axelrod, who was