Shields, Brooks on Romney's Electability, Cain's 9-9-9...

Columnists Mark Shields and David Brooks weigh in on the week's top political news, including GOP contender Mitt Romney's foreign policy vision and electability, rival Republican candidate Herman Cain's "9-9-9" plan to overhaul the U.S. tax code plus the Occupy Wall Street protests that are spreading beyond New York City.