Perry leads assault on Romney while Paul defends his position on foreign affairs, as the remaining Republican presidential candidates face off in the Fox News/Wall Street Journal debate ahead of South Carolina's primary.2012 GOP Candidate Tracker | WEIGH IN: Are Candidates Dodging or Answering Debate Questions?Huntsman Ends Bid for President, Backs Romney | JUAN WILLIAMS: GOP Voters Have Lots to Be Angry AboutAs Rivals Attack Romney's Business Record, His Claims Have Contributed to ConfusionFOX NEWS POLLS: Obama-Romney Race Would be Close | Romney Hits New High, Santorum Seen as True ConservativeVIDEOS: Paul Attacks Santorum's Record | Perry Calls for Romney Tax Records | Gingrich on Negative Ads