Republican presidential candidate, former Massachusetts Gov. Mitt Romney, listens as he is introduced by Sen. Kelly Ayotte, R-N.H., as he campaigns at Pinkerton Academy in Derry, N.H., Saturday, Jan. 7, 2012. (AP Photo/Charles Dharapak)

Photo by: Charles Dharapak

Republican presidential candidate, former Massachusetts Gov. Mitt Romney, listens as he is introduced by Sen. Kelly Ayotte, R-N.H., as he campaigns at Pinkerton Academy in Derry, N.H., Saturday, Jan. 7, 2012. (AP Photo/Charles Dharapak)