Hillary would not have left the 9/11 ceremony unless she absolutely had to. She has always made 9/11 her signature issue and, amid concerns about her health, she would not have left unless she had no alternative. As she got into her car, she appeared to faint, losing a shoe as she was virtually carried into the car. She won't withdraw unless he has to. But anxious Democrats will be so worried if she fails to be able to campaign and her health escalates as an issue that they might bring unbearable pressure on her to step aside. If that...