Think Progress has a link-o-riffic debunking of some right-wing Katina memes.   Here’s an example — there are many more:

CLAIM — STATE AND LOCAL OFFICIALS WERE MOSTLY RESPONSIBLE FOR FAILURES: “White House Shifts Blame to State and Local Officials” [Washington Post, 9/4/05]

FACT – BUSH PUT FEMA IN CHARGE OF EFFORT BEFORE KATRINA STRUCK: “Specifically, FEMA is authorized to identify, mobilize, and provide at its discretion, equipment and resources necessary to alleviate the impacts of the emergency.” [White House, 8/27/05]