Well, I don't buy that they're all necessarily dumb, but some certainly are entertaining (and dumb).
11) "What didn't go right?'" –President Bush, as quoted by House Minority Leader Nancy Pelosi (D-CA), after she urged him to fire FEMA Director Michael Brown "because of all that went wrong, of all that didn't go right" in the Hurricane Katrina relief effort (Source)
13) "We finally cleaned up public housing in New Orleans. We couldn't do it, but God did." –Rep. Richard Baker (R-LA) to lobbyists, as quoted in the Wall Street Journal (Source)
17) "I believe the town where I used to come – from Houston, Texas, to enjoy myself, occasionally too much – will be that very same town, that it will be a better place to come to." –President Bush, on the tarmac at the New Orleans airport, Sept. 2, 2005 (Source)
20) "We just learned of the convention center – we being the federal government – today." –FEMA Director Michael Brown, to ABC's Ted Koppel, Sept. 1, 2005, to which Koppel responded " Don't you guys watch television? Don't you guys listen to the radio? Our reporters have been reporting on it for more than just today." (Source)