A great city has descended into chaos. In much of New Orleans yesterday, food and water remained in short supply. Medical help was nowhere to be found. And answers were impossible to come by. Then hope ran out and it was the biggest loss of all. At the city's convention center, a frustrated and angry mob rioted, furious that they had been dumped at a place where there was no food, no water and no one in charge. At the Superdome, fights broke out in the huge crowd that assembled on an upper parking deck. The crowd jostled for position...