A man walks out of the Ohio headquarters of Mitt Romney campaign office carrying a Nobama 2012 sign, Wednesday, Nov. 7, 2012, in Columbus, Ohio. Romney conceded the presidential election shortly after midnight Wednesday. (AP Photo/Tony Dejak)

Photo by: Tony Dejak

A man walks out of the Ohio headquarters of Mitt Romney campaign office carrying a Nobama 2012 sign, Wednesday, Nov. 7, 2012, in Columbus, Ohio. Romney conceded the presidential election shortly after midnight Wednesday. (AP Photo/Tony Dejak)