Bill Maher on humor in politics: "Don't be tribal"
Comedian Bill Maher, host of the HBO series "Real Time," doesn't discriminate between right and left when aiming his barbs at tribal politics. He talks with CBS News chief election & campaign correspondent Robert Costa about gladly courting controversy, whether by mocking politicians or inviting them to his show. He also discusses his new book, "What This Comedian Said Will Shock You."