Gibbs asked about birthers

Says Obama was born in Hawaii. Surprise. It's always an interesting, and difficult, question as to when you ignore these kind of loony fringe attacks, and when you take them head on and squelch them. Sometimes taking them on gives them air, and life, other times ignoring them lets them fester. It's really a gut instinct, knowing when and how to react to something in a way which won't itself cause the thing to become a bigger story (the Heisinberg Uncertainty Principle of PR).