On the two year anniversary of the devastation of Hurricane Katrina, there is one thing that the poor of New Orleans haven't lost: their invisibility. And nor must they lose their anger. It is right to feel anger, and shame as well. And our government? Where history and circumstance called for grand vision and sustained effort, we got instead sophomoric cheerleading and constricted effort and de facto racial discrimination. So today, the state of flood control remains uncertain, though safer for whites than for blacks, and the state of new housing for displaced poor people, almost all black, is disgraceful.