For better or worse, George W. Bush's historical legacy will be built on the Federal and National response to the New Orleans Diaspora, not the War on Terror as the neocons wanted.
How this changes the dynamics of the Administration remains to be seen. Unlike NYC, were the developers are still hangling over the whole in the ground, but the people have homes and jobs; the effects of the NOLA Submergence has families distrupted, homes and businesses lost, and massive infastructural damage that has a ripple-effect throughout the Mississippi Basin and the East Coast. This is a diaspora on a national-scale not seen since the Dust Bowl, and will have long-term social and economic dislocations.