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.

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Nor can the president's acceptance of "responsibility" for the disaster dislodge what came before. Mr. Bush didn't cough up his modified-limited mea culpa until he'd seen his whole administration flash before his eyes. His admission that some of the buck may stop with him (about a dime's worth, in Truman dollars) came two weeks after the levees burst and five years after he promised to usher in a new post-Clinton "culture of responsibility." It came only after the plan to heap all the blame on the indeed blameworthy local Democrats failed to lift Mr. Bush's own record-low poll numbers. It came only after America's highest-rated TV news anchor, Brian Williams, started talking about Katrina the way Walter Cronkite once did about Vietnam.

I leave the rest to you: The shameless using of Laura Bush as a shill, Donald Rumsfeld complaining of looters in NOLA while doing nothing to prevent the looting of Iraq by Iraqis, the prime time set up for the speech at Jackson Square by Karl Rove's Imagineers, etc.