Mitt Romney and Newt Gingrich are the current front-runners in the contest to become the Republican candidate for president. It was only months ago that former House speaker Gingrich was written off by many as unelectable. In recent weeks he has surged in the polls. This week Gingrich is seeking gains in New Hampshire, an early primary state where Romney enjoys widespread popularity. Gingrich debated third-tier candidate Jon Huntsman on national security issues. On the sidelines, Gingrich broke his vow to stay positive and traded barbs with Romney. Diane and her guests discuss the shifting dynamics in the race for the GOP presidential nomination.