As Usual, Frank Rich Nails It:

Once Toto parts the curtain, the Wizard of Oz can never be the wizard again. He is forever Professor Marvel, blowhard and snake-oil salesman. Hurricane Katrina, which is likely to endure in the American psyche as long as L. Frank Baum's mythic tornado, has similarly unmasked George W. Bush.

The worst storm in our history proved perfect for exposing this president because in one big blast it illuminated all his failings: the rampant cronyism, the empty sloganeering of "compassionate conservatism," the lack of concern for the "underprivileged" his mother condescended to at the Astrodome, the reckless lack of planning for all government operations except tax cuts, the use of spin and photo-ops to camouflage failure and to substitute for action.

You can read the rest here.