Take a blank sheet of paper and some crayons and draw a mushroom cloud. That's the only proof of a WMD program that Bush can produce, and many Americans will accept the drawing a proof.
It is not the first time that a crude drawing has been accepted as evidence of WMD. Remember the Rosenbergs?:
Prominent in the case against Julius Rosenberg were the sketches David Greenglass allegedly made for Gold of a high explosive lens mold used to make the atom bomb. Greenglass claimed also that he later gave Julius a sketch of a nuclear "implosion bomb" and a 12-page description of it, which he claimed was then typed up by Ethel Rosenberg. Replicas of Greenglass’s drawing of the lens mold and the atom bomb cross-section were presented by prosecuting attorneys Irving Saypol and Roy Cohn at the trial. The drawings, done by Greenglass after he was taken into police custody, were crude and amateurish. This is not surprising, since Greenglass, as a machinist, had no scientific training. That didn’t stop the prosecution from presenting witnesses willing to testify as to the usefulness and accuracy of the drawings. All the so-called physical evidence presented, from the "trick" table to the Jello box to the sketches, were merely illustrations of things that were asserted to have existed–not real evidence of anything.
The only real proof of the Rosenbergs’ guilt that the prosecution presented was their left-wing affiliations. Prosecutor Irving Saypol opened his case: "The evidence will show that the loyalty and allegiance of the Rosenbergs and Sobell were not to our country, but that it was to communism, communism in this country and communism throughout the world."9
http://www.isreview.org/issues/29/rosenbergs.shtml