The most devastating ads in politics are the ones that make themselves - that is, when a candidate's opponent makes a public gaffe that reinforces the most salient arguments against themselves. John Kerry sealed his fate as a flip-flopper with the "I voted for it before I voted against" which the Bush team promptly turned into one its most powerful spots of the 2004 race. This ad from Heather Wilson's campaign is an equally devastating and effective spot against Democrat Patricia Madrid on taxes: