This is a hilarious parody of Alan Grayson's by-now-notorious "Taliban Dan" ad, aimed at an opponent who -- surprise, surprise! -- is leading him in the polls.
And then there is this, my favorite parody attack ad:
Seriously, though, folks, with the nation within sight of a serious fiscal crisis, isn't the current plague of negative campaigning simply irresponsible? One of the cliches of the punditry is that (a) people say in poll after poll that they hate negative ads, but (b) they work. I think this time (b) will turn out to be false. With the nation in sight of a serious fiscal crisis, most people will see these attack ads as something akin to fiddling while Rome burns. If your opponent has committed a felony, by all means expose it. Otherwise, talk about the issues! Update: Note the refinement/revision of the above that I introduce in response to a comment, below.