Who is Howard Dean?

Howard Dean says he's running for President, and on paper he's quite a candidate.

He's the longest-serving Democratic governor. He signed the first law in the country to allow gay unions. And, he's got the endorsement of America's favorite president-that-isn't: Martin Sheen.

In real life, most Americans would pass Howard Dean on the street without a second glance. Can a candidate with just about zero national name-recognition actually make a viable run for the nation's highest office? Tonight, Howard Dean, the invisible candidate.

Guests:

Howard Dean, Governor of Vermont and presidential hopeful