The FEMA response was not slow. They were rolling two days before the storm arrived.
-- Why is Bush taking the blame?
-- I hope the truth comes out.
If President Bush points this out, the Dems will say he is just trying to shift the blame (as they already have). By taking the blame, he has defused a lot of their attack.
I think President Bush believes in the truth and trusts others who believe in the truth to bring it out.