Photo by: Charles Krupa

** FILE ** Six candidates vying for the Republican presidential nomination — (from left) former Utah Gov. Jon Huntsman, former Pennsylvania Sen. Rick Santorum, former Massachusetts Gov. Mitt Romney, Texas Rep. Ron Paul, former House Speaker Newt Gingrich and Texas Gov. Rick Perry — are introduced before a GOP presidential candidate debate at the Capitol Center for the Arts in Concord, N.H., on Sunday, Jan. 8, 2012. (AP Photo/Charles Krupa)