Guys like Jesse Jackson and his ilk have also been saying that the slow response is solely because the majority of victims were black.

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Too bad they haven't read their own constitution regards the separation of state and federal powers... however inept the DHS and FEMA might be, the feds can't move until called by the locals, who were moronically unprepared and incapable of handling the crisis. Note how efficiently the army was the moment it hit the ground? It takes a while to put that operation into action; it could have been there a lot sooner if the local morons had just recognized they were in over their heads (pun intended).
Jesse and the others who are screaming race ("it's all Bush's fault, Bush hates blacks") can go take a long walk off a short pier (2nd pun intended).