Republican presidential candidate, former House Speaker Newt Gingrich pauses during a campaign stop at the Tulare World Ag Expo Tuesday, Feb. 14, 2012, in Tulare, Calif. (AP Photo/Evan Vucci)

Republican presidential candidate, former House Speaker Newt Gingrich pauses during a campaign stop at the Tulare World Ag Expo Tuesday, Feb. 14, 2012, in Tulare, Calif. (AP Photo/Evan Vucci)