Former House Speaker Newt Gingrich pauses during a presidential campaign stop at Food City in Chattanooga, Tenn., on Monday, March 5, 2012. (AP Photo/Evan Vucci)

Photo by: Evan Vucci

Former House Speaker Newt Gingrich pauses during a presidential campaign stop at Food City in Chattanooga, Tenn., on Monday, March 5, 2012. (AP Photo/Evan Vucci)