Contrast This.

Usually when we talk about a "contrast ad," it's more or less a euphemism for going negative.

This is a negative ad from the Koch Brothers:


This is the Obama campaign's response:


Contrast.

I love the direct, personal and slightly humorous nature of the response. Notice how she says "arm you" with the facts. It's so Obama. Too bad only people who already agree are going to see or hear it.