Republican presidential candidate, former Massachusetts Gov. Mitt Romney laughs as he hands out beef jerky to the press on his campaign plane, Friday, Sept. 28, 2012, in Philadelphia. (AP Photo/ Evan Vucci)

Photo by: Evan Vucci

Republican presidential candidate, former Massachusetts Gov. Mitt Romney laughs as he hands out beef jerky to the press on his campaign plane, Friday, Sept. 28, 2012, in Philadelphia. (AP Photo/ Evan Vucci)