The lack of coordination in response to this incident is the fault of local, state, and federal agencies. "In July 2004, more than 40 federal, state, local and volunteer organizations practiced this very scenario in a five-day simulation code-named "Hurricane Pam," where they had to deal with an imaginary storm that destroyed over half a million buildings in New Orleans and forced the evacuation of a million residents." Source

I hope no one seriously blames Bush for the actual hurricane. But, there were concerns raised when FEMA became a part of DHS. This has been an issue for some time, and veterans of FEMA predicted they may not be able to respond promptly in the face of future catastrophic natural disasters. Source: Disaster in the making