Mitt Romney's final campaign

Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks at a campaign event at Port Columbus International Airport, Nov. 5, 2012, in Columbus, Ohio. (AP Photo)

Republican presidential candidate, former Massachusetts Gov. Mitt Romney, left, and his wife Ann, step to the edge of the stage after Romney's speech at a campaign event at Port Columbus International Airport, Nov. 5, 2012, in Columbus, Ohio. (AP Photo)

Republican presidential candidate and former Massachusetts Gov. Mitt Romney and Ann Romney arrive at a Ohio campaign rally at Port Columbus International Airport, in Columbus, Ohio, Nov. 5, 2012. (AP Photo)

Republican presidential candidate and former Massachusetts Gov. Mitt Romney kisses his wife Ann at a Ohio campaign rally at Port Columbus International Airport, in Columbus, Ohio, Nov. 5, 2012. (AP Photo)

Republican presidential candidate, former Massachusetts Gov. Mitt Romney give a speech to supporters, Nov. 5, 2012 at the Sanford International Airport, Sanford, Fla. (AP Photo)

Republican presidential candidate, former Massachusetts Gov. Mitt Romney, right, walks through the crowd with wife Ann to take the stage at a campaign event at the Verizon Wireless Arena, Nov. 5, 2012, in Manchester, N.H. (AP Photo)

Republican presidential candidate, former Massachusetts Gov. Mitt Romney, right, takes the stage with wife Ann before speaking at a campaign event at the Verizon Wireless Arena, Nov. 5, 2012, in Manchester, N.H. (AP Photo)

Republican presidential candidate, former Massachusetts Gov. Mitt Romney greets supporters after speaking at a campaign event at the Verizon Wireless Arena, Nov. 5, 2012, in Manchester, N.H. (AP Photo)

Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks at a campaign event at the Verizon Wireless Arena, Nov. 5, 2012, in Manchester, N.H. (AP Photo)

Republican presidential candidate and former Massachusetts Gov. Mitt Romney speaks at a New Hampshire campaign rally at Verizon Wireless Arena in Manchester, N.H., Nov. 5, 2012. (AP Photo)

Republican presidential candidate and former Massachusetts Gov. Mitt Romney and Ann Romney react to the crowd's cheers at a New Hampshire campaign rally at Verizon Wireless Arena in Manchester, N.H., Nov. 5, 2012. (AP Photo)

Republican presidential candidate and former Massachusetts Gov. Mitt Romney hugs Ann Romney after she introduced him at a New Hampshire campaign rally at Verizon Wireless Arena in Manchester, N.H., Nov. 5, 2012. (AP Photo)

Republican presidential candidate and former Massachusetts Gov. Mitt Romney speaks at a New Hampshire campaign rally at Verizon Wireless Arena in Manchester, N.H., Nov. 5, 2012. (AP Photo)

Republican presidential candidate and former Massachusetts Gov. Mitt Romney waves at the end of a New Hampshire campaign rally at Verizon Wireless Arena in Manchester, N.H., Nov. 5, 2012. (AP Photo)