Dean Reynolds of ABC News couldn't find a single person in Houston who thought the federal government "screwed up". Push polls are for handwringing FR pinheads, looking for a reason to bash this President.
That is not a scientifically valid method of polling.
Look I agree with you - the media has pushed the notion that the federal government was to blame when in fact FEMA is not a first responder. The problem is that Bush has done nothing to correct that false impression. His speech came across as a mae culpa and "I'll make sure we do better next time" speech.