Republican presidential candidate Mitt Romney writes on a white board Aug. 16, 2012, as he talks about Medicare during a news conference at Spartanburg International Airport in Greer, S.C. (Associated Press)

Photo by: Evan Vucci

Republican presidential candidate Mitt Romney writes on a white board Aug. 16, 2012, as he talks about Medicare during a news conference at Spartanburg International Airport in Greer, S.C. (Associated Press)