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)

Associated Press
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)
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)
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