Clash of Titans during latest GOP debate

Rick Santorum and Ron Paul sometimes just bystanders, the focus during Monday night's GOP debate between Mitt Romney and Newt Gingrich. Romney on the attack, accusing Gingrich of influence peddling.

Romney explaining to moderator Brian Williams that he took the high road in South Carolina - but by doing so he took a lot of unanswered punches. No more, he said.