Republican presidential nominee and former Massachusetts Governor Mitt Romney talks to U.S Senator Rob Portman on his campaign plane enroute to Denver

Republican presidential nominee and former Massachusetts Governor Mitt Romney talks to U.S Senator Rob Portman (R-OH) (R) on his campaign plane enroute to Denver, Colorado October 1, 2012, ahead of Romney's first debate with U.S. President Barack Obama. REUTERS/Brian Snyder