"Senator Obama, I am not President Bush," one of McCain's key lines at the final presidential debate, is rebutted in this Obama ad that ends with footage of McCain saying he has voted for Bush's policies more than many of his Republican colleagues.

Obama TV ad: "90 Percent"

UPDATE: The Service Employees International Union (SEIU) makes the same argument, in a jazzy ad that cleverly plays with the letters "W" and "M."

SEIU ad "What's the difference:"

UPDATE: In this McCain Web ad, the Republican candidate describes his plans, and creates some distance between himself and the Bush administration, with the opening line "The last years haven't worked very well, have they? I'll make the next four better."