GOP presidential debate in Iowa (15 images)

Republican 2012 presidential candidate and former House Speaker Newt Gingrich gestures as he responds to a question during a GOP debate in Sioux City, Iowa, December 15, 2011, in advance of Iowa's first-in-the-nation caucuses, January 3, 2012. UPI/Mike Theiler

Republican presidential candidate, Rep. Ron Paul, R-Texas, speaks during a Republican presidential debate in Sioux City, Iowa on December 15, 2011. UPI/Eric Gay/Pool

Republican presidential candidate, former Massachusetts Gov. Mitt Romney, speaks during a Republican presidential debate in Sioux City, Iowa on December 15, 2011. UPI/Eric Gay/Pool

Republican presidential candidate Texas Gov. Rick Perry, speaks during a Republican presidential debate in Sioux City, Iowa on December 15, 2011. UPI/Eric Gay/Pool