** FILE ** Former Massachusetts Gov. Mitt Romney waves to supporters at the Romney for President New Hampshire primary night rally at Southern New Hampshire University in Manchester, N.H., on Tuesday, Jan. 10, 2012. Behind Mr. Romney are his sons Tagg (left) and Craig and his wife, Ann. (AP Photo/Elise Amendola)

Photo by: Elise Amendola

** FILE ** Former Massachusetts Gov. Mitt Romney waves to supporters at the Romney for President New Hampshire primary night rally at Southern New Hampshire University in Manchester, N.H., on Tuesday, Jan. 10, 2012. Behind Mr. Romney are his sons Tagg (left) and Craig and his wife, Ann. (AP Photo/Elise Amendola)