Even if it was, he's claiming that his actual statement was meant to imply that the President of the United States is uneducated. I don't see how that's a whole lot better than what he actually said.
Especially since President Bush had good grades as opposed to Kerrys. Someone in the dim party had to scramble fast to come up with "it was a joke" excuse. Pitiful, pathetic losers. Kerry said our troops are stupid. Not a joke and not funny.