McCain is clearly articulating why Obama would be a fiscal joke in the oval office. What McCain is also doing is contrasting the words of Obama vs. his deeds and then smartly appealing for the voters to "just check our records"...
McCain IS WIPING THE FLOOR WITH OBAMA - FACT
Yeah, but Obama is a convincing liar. If we're trying to appeal to the squishy no nothing middle than Obama is doing better because he lies good.