TONIGHT: Star of "Pride & Prejudice," Keira Knightley! Plus Rob Corddry on "You Paid For It ... With Your Money," and Lewis Black with "Back in Black."

Jason Jones visits the gayest city in America, and Keira Knightley learns about the Santorum.

Two aging incumbents win re-election, Jordan Klepper and Jessica Williams share campus safety do's and don'ts, and Keira Knightley describes singing in "Begin Again."