Another example that demonstrates that humorless stiffs like John Kerry shouldn't be attempting to be funny. He muffed what was a dumb joke about Bush in the first place, and now he wants to take a stand because he thinks he let the republicans pushed him around in his presidential run, and he wants to maintain his "credibility" as a candidate for president in 2008.
John, you won't be nominated, you had your shot, now shut up and sit down.