[Cindy] McCain … said the presidential candidate Sen. Barack Obama has “waged the dirtiest campaign in American history” …

“What I have found is that it’s necessary to make sure the American people understand what we have to say, what we stand for as a husband and wife, and what we will do for the American people if we’re lucky enough to be elected,” Cindy McCain said.

Source.

Because you won’t see any negative campaigning from the McCain camp.