Plot: 2012/01/17 Headlines: Romney Comes Under Fire at Republican Debate in South Carolina; Romney: I Oppose Negotiating with the Taliban; Ron Paul: "They're Building Up for War Against Iran"; Jon Huntsman Drops Out of Republican Race; Christian Right Leaders Back Rick Santorum; Architect of Anti-Immigrant Bills Endorses Romney; Homeland Security Hired Contractor to Monitor Websites; Report: U. S