Later rehearsals were held in hotels across the country as he campaigned, with Ohio Sen. Rob Portman playing the part of President Barack Obama. View photos In all, Romney held 16 mock debates and arrived in Denver, the site of his first meeting with Obama, several days in advance for final run-throughs and even to prepare for the host citys altitude. He won high marks in the opening debate against a lackluster Obama, who picked up his game in later debates. Former Michigan Gov. Jennifer Granholm, who played then-Alaska Gov. Sarah Palin in mock debates against Vice President Joe Biden in 2008,

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