I finally watched the video and I'd like to know how that was intended to be funny.
Kerry maintains that he mis-spoke...that he intended to say that if you don't do well in school you end up in the Bush administration.
I maintain that the key to the character of a person is in the things that are said when the guard is down. Those words that come when the brain is idling and the mouth is still in motion, that's when you get a glimpse of what is behind all the fronts and masks.
Kerry may have intended to slam the President, but perhaps he let us know how he really feels.