Barack Obama speaks during a campaign rally at the Farm Bureau Live arena, in Virginia Beach, Virginia, on September 27, 2012. #

Mitt Romney speaks during a campaign rally at the Wings Over the Rockies Air and Space Museum in Denver, Colorado, on October 1, 2012. #

President Barack Obama boards Air Force One at Andrews Air Force Base, Maryland, on September 20, 2012, en route to Florida. #

Mitt Romney boards his campaign plane at the Philadelphia International Airport in Philadelphia, Pennsylvania, on September 28, 2012. #

Barack Obama arrives to speak at a campaign event at Lions Park, Thursday, Sept. 13, 2012, in Golden, Colorado. #

Mitt Romney takes the stage at a campaign rally in Denver, Colorado, on September 23, 2012. #

US Secret Service agents watch as President Barack Obama (left) greets supporters at O'Hare International Airport in Chicago, on August 11, 2012. #

Barack Obama speaks in the rain during a campaign rally in Glen Allen, Virginia, on July 14, 2012. #

Mitt Romney hugs a supporter as he campaigns in the rain at Lake Erie College in Painesville, Ohio, on September 14, 2012. #

Barack Obama greets supporters at a campaign rally at Desert Pines High School on September 30, 2012 in Las Vegas, Nevada. #

Mitt Romney greets the crowd after a campaign rally at the Valley Forge Military Academy in Wayne, Pennsylvania, on September 28, 2012. #

Barack Obama speaks during a campaign rally at the Milwaukee Theater in Milwaukee, Wisconsin September 22, 2012. #

Mitt Romney speaks at a campaign fundraising event at the Beverly Hilton Hotel in Los Angeles, on September 22, 2012. #

Mitt Romney holds a baby after making a campaign stop at American Legion Post 176, on September 27, 2012, in Springfield, Virginia. #

Supporters hold up signs as Barack Obama speaks at a campaign rally at the Henry Maier Festival in Milwaukee, Wisconsin, on September 22, 2012. #

Supporters cheer as Mitt Romney speaks during a campaign rally at SeaGate Convention Center in Toledo, Ohio, on September 26, 2012. #

A Secret Service agent stands guard as Mitt Romney speaks during a campaign event at LeClaire Manufacturing in Bettendorf, Iowa, on August 22, 2012. #

Mitt Romney poses for a photo with workers as he makes an unscheduled stop at a Chipotle restaurant in Denver, Colorado, on October 2, 2012. #

Barack Obama arrives at Miami-Dade International Airport, on September 20, 2012 in Miami, Florida. #

Mitt Romney boards his plane in Cleveland, Ohio, before taking off for Boston on September 14, 2012. #

Supporters of Barack Obama cheer in the audience at an election campaign rally in Virginia Beach, Virginia, on September 27, 2012. #

Supporters cheer as they listen to Mitt Romney speak during a Juntos Con Romney Rally at the Darwin Fuchs Pavilion, on September 19, 2012 in Miami, Florida. #

Barack Obama embraces First Lady Michelle Obama after speaking during a campaign event at the University of Iowa in Iowa City, Iowa, on September 7, 2012. #

Mitt Romney is joined by his wife Ann at a campaign fundraiser in Beverly Hills, California, on September 22, 2012. #

Barack Obama pauses during a campaign speech at the Bowling Green State University on September 26, 2012 in Bowling Green, Ohio. #

Mitt Romney speaks during a rally at Valley Forge Military Academy and College in Wayne, Pennsylvania, on September 28, 2012. #

Barack Obama greets supporters after speaking at a campaign rally at the Kent State University on September 26, 2012 in Kent, Ohio. #

Mitt Romney campaigns at the Ringling Museum of Art in Sarasota, Florida, on September 20, 2012. #

Mitt Romney works on his iPad before attending a fundraising event on Wednesday, August 22, 2012 in Little Rock, Arkansas. #

Barack Obama walks on the tarmac upon his arrival in Swanton, Ohio, on September 26, 2012. #

Mitt Romney is reflected on the side of his vehicle as he leaves The Church of Jesus Christ of Latter Day Saints in Wolfeboro, New Hampshire, on September 2, 2012. #

Barack Obama delivers remarks during a campaign on the campus of St. Petersburg College in St Petersburg, Florida, on September 8, 2012. #

Mitt Romney campaigns at Van Dyck Park in Fairfax, Virginia, on September 13, 2012. #

Barack Obama carries boxes of pizza as he arrives for an unannounced stop at a campaign office October 1, 2012 in Henderson, Nevada. #

Mitt Romney carries boxes of pizza for firefighters in New York, on May 1, 2012. #

Mitt Romney thanks supporters at the end of a campaign rally September 24, 2012 at Pueblo Memorial Airport in Pueblo, Colorado, on September 24, 2012. #

Mitt Romney wipes sweat from his face during a campaign rally at Absolute Style furniture on August 12, 2012 in High Point, North Carolina. #

Barack Obama hugs a supporter after speaking at a campaign event at the Palm Beach County Convention Center in West Palm Beach, Florida, on September 9, 2012. #

Mitt Romney hugs a supporter as he campaigns in Pueblo, Colorado, on September 24, 2012. #

A light shines behind Barack Obama as he speaks during a campaign event at Bayliss Park, in Council Bluffs, Iowa, on August 13, 2012. #

Mitt Romney takes part in a roundtable discussion on manufacturing at American Spring Wire in Bedford Heights, Ohio, on September 26, 2012. #

Barack Obama stops to talk a greet two young supporters at a campaign event at Farm Bureau Live, in Virginia Beach, Virginia, on September 27, 2012. #

Mitt Romney greets supporters after speaking at a campaign rally at Lake Erie College in Painesville, Ohio, on September 14, 2012. #

Mona Renee Johnson listens as Barack Obama speaks during a campaign event at the Cashman Center in Las Vegas, Nevada, on September 12, 2012. #

Supporters of Mitt Romney attend a campaign rally at the Wings Over the Rockies Air and Space Museum in Denver, Colorado, on October 1, 2012. #

Barack Obama speaks to supporters during a campaign stop on September 12, 2012 in Las Vegas, Nevada. #

Mitt Romney speaks at a campaign rally in Fairfax, Virginia, on September 13, 2012. #