Keeping Them Honest: Are Congressional offices revolving doors for lobbyists?

Nancy Pelosi was hoping to avoid cameras as she walked into a fundraiser at a Washington restaurant. It was a CNN intern who caught cell phone video of her and her staff entering the event through a kitchen door. Twelve of the people listed as hosts on the invitation are former Pelosi staffers, advisers or aids.

CNN Senior Investigative Correspondent Drew Griffin looks at how Capitol Hill is turning into something of a "Lobbying University," where staffers are learning the ropes before joining in this lucrative field.