

President Barack Obama arrives under rainy skies in North Canton, Ohio, on his way to Kent State University, Sept. 26, 2012. Jason Reed/Reuters
Supporters hold up an Ohio sign as President Barack Obama speaks at a campaign event at The Memorial Athletic and Convocation Center at Kent State University Sept. 26, 2012, in Kent, Ohio. Tony Dejak/AP
President Barack Obama shakes hands with supporters after speaking at a campaign event at The Memorial Athletic and Convocation Center Sept. 26, 2012, in Kent, Ohio. Tony Dejak/AP
President Barack Obama greets supporters at a campaign event at Kissimmee Civic Center, Sept. 8, 2012, in Kissimmee, Fla. Pablo Martinez Monsivais/AP
Vice President Joe Biden arrives to speak at a campaign event at Milford High School, Sept. 9, 2012, in Milford, Ohio. Carolyn Kaster/AP
US President Barack Obama makes phone calls to volunteers from the Obama for America Field Office in Port St. Lucie, Florida, while campaigning across the state by bus, September 9, 2012. Larry Downing/Reuters
A young supporter listens to President Barack Obama speak at a campaign event at West Palm Beach County Convention Center, Sept. 9, 2012, in West Palm Beach, Fla. Pablo Martinez Monsivais/AP
President Barack Obama greets supporters at a campaign event Sept. 9, 2012, in Melbourne, Fla. John Raoux/AP
President Barack Obama speaks during a campaign event at Strawbery Banke Museum in Portsmouth, N.H., Friday, Sept. 7, 2012. Pablo Martinez Monsivais/AP
(From l.) President Barack Obama, first lady Michelle Obama, Vice President Joe Biden, and Dr. Jill Biden wave to thousands at a campaign stop, Friday, Sept. 7, 2012, in Portsmouth, N.H. Jim Cole/AP
A girl waves a flag as she is held above the crowd while US President Barack Obama speaks during a campaign event in Rochester, New Hampshire Aug. 18, 2012. Kevin Lamarque/Reuters
President Barack Obama greets people on the tarmac after arriving at John F. Kennedy International Airport, July 30, 2012, in New York. Jason DeCrow/AP
President Barack Obama rolls up his sleeves while walking from Air Force One upon his arrival in West Palm Beach, Florida July 19, 2012. Obama is on a two-day campaign swing through Florida. Kevin Lamarque/Reuters
President Barack Obama gives a 'thumbs-up' as he carries bags of apples during his arrival on the South Lawn of the White House on Marine One helicopter, Aug. 18, 2012 in Washington. Obama purchased the apples and other items in a campaign stop at Mack's Apples in Londonderry, New Hampshire. Pablo Martinez Monsivais/AP
President Barack Obama waves before he speaks at a campaign event at Loudoun County High School in Leesburg, Virginia, August 2, 2012. Larry Downing/Reuters
People observe a moment of silence with President Barack Obama for the victims of the Aurora, Colo., shooting at an event at the Harborside Event Center in Ft. Myers, Fla., Friday, July 20, 2012. Obama, who was scheduled to spend the day campaigning in Florida, cancelled his campaign events to return to Washington to monitor the shooting. Susan Walsh/AP
President Barack Obama gives a boy a high-five at a campaign event in Jacksonville, Florida July 19, 2012. Kevin Lamarque/Reuters
President Barack Obama greets the crowd at a campaign event at the Cincinnati Music Hall in Cincinnati, Monday, July 16, 2012. Susan Walsh/AP
Marines wait at the steps of Marine One for President Barack Obama (r.) to alight and walk to Air Force One at New York's JFK Airport August 6, 2012. Obama flew to Connecticut to participate in election campaign fundraisers. Deputy White House Press Secretary Josh Earnest (2nd r.) stands beside Obama. Jason Reed/Reuters
President Barack Obama gestures at a campaign stop in Oakland, Calif., Monday, July 23, 2012. Paul Sakuma/AP
White House guests watch as President Barack Obama walks across the South Lawn of the White House in Washington, Aug. 1, 2012, toward Marine One. Haraz N. Ghanbari/AP
President Barack Obama holds a re-election campaign rally despite the heavy rain at the historic Walkerton Tavern & Gardens in Glen Allen, Va., near Richmond Saturday, July 14, 2012. It is in the Congressional district represented by House Majority Leader Eric Cantor, R-Va., a key county in a crucial swing state of the presidential election. J. Scott Applewhite/AP
First lady Michelle Obama arrives to speak to a crowd of supporters during a campaign stop at the Dayton Convention Center Tuesday, July 24, 2012, in Dayton, Ohio. Skip Peterson/AP
President Barack Obama (l.) orders food during a stop at Skyline Chili restaurant in Cincinnati July 16, 2012. Jason Reed/Reuters
Obama campaign volunteers, Alex Payne (l.) distribute tickets for Friday's visit by Michelle Obama on Wednesday, July 18, 2012 in Fredericksburg, Va. Robert A. Martin//The Free Lance-Star/AP
President Barack Obama waves to the supporters after a campaign speech at Green Run High School in Virginia Beach, Va., Friday, July 13, 2012. Steve Helber/AP
Supporters of President Barack Obama chant 'four more years' at a campaign event at Oyster River High School in Durham, New Hampshire, on June 25, 2012. Larry Downing/Reuters
A woman (c.) wearing a shirt with the likeness of President Obama watches Obama (l.) talking with greeters upon his arrival in Tampa, Florida, on June 22, 2012. Kevin Lamarque/Reuters
Supporters listen to Barack Obama speak during a campaign event at Hillsborough Community College in Tampa, Florida, on June 22, 2012. Kevin Lamarque/Reuters
President Barack Obama speaks during an campaign fundrasising concert at the Fillmore Miami Beach at the Jackie Gleason Theater, on June 26, 2012, in Miami Beach. Carolyn Kaster/AP
President Barack Obama poses for a photo with Myra Soukup, 16 (c.) as Jane Soukup (l.) makes the image with an iPad, upon his arrival in Minneapolis, on June 1, 2012, for an event on the economy at Honeywell, followed by a campaign event. Genevieve Ross/AP
President Barack Obama greets supporters after speaking at a campaign event at Hillsborough Community College in Tampa, Florida, on June 22, 2012. Kevin Lamarque/Reuters
President Barack Obama arrives to speak at a campaign event at Hillsborough Community College in Tampa, Florida, on June 22, 2012. Kevin Lamarque/Reuters
A woman clutches a book about Obama as supporters await Obama upon his arrival in Cleveland, Ohio, on June 14, 2012. Kevin Lamarque/Reuters
President Obama talks to girls during a visit to the Boys and Girls Club of Cleveland, Broadway section, in Cleveland, Ohio, on June 14, 2012. Kevin Lamarque/Reuters
The audience applauds as President Obama speaks at a campaign event at Symphony Hall, on June 25, 2012, in Boston. Carolyn Kaster/AP
First lady Michelle Obama meets with supporters during a campaign event for her husband President Barack Obama, on June 6, 2012, at the National Constitution Center in Philadelphia. Matt Rourke/AP
A boy and a girl in the audience listen to President Obama speak at a campaign event at the Symphony Hall in Boston June 25, 2012. Larry Downing/Reuters
President Barack Obama kisses first lady Michelle Obama at the steps of Air Force One upon his arrival in New York, on June 14, 2012. The Obamas arrived in New York for a campaign fund raising event. Kevin Lamarque/Reuters
President Obama greets supporters upon his arrival in Denver, Colorado, on May 23, 2012. Kevin Lamarque/Reuters
President Barack Obama speaks at a campaign event at Oyster River High School in Durham, New Hampshire, on June 25, 2012. Larry Downing/Reuters
People look out of their window as a police officer stands along the street where President Barack Obama will hold a fundraiser with actress Sarah Jessica Parker, in New York, on June 14, 2012. Keith Bedford/Reuters
President Barack Obama receives a hug at a campaign event at Oyster River High School in Durham, New Hampshire, on June 25, 2012. Larry Downing/Reuters
Campaign volunteers for President Barack Obama listen to a speech by first lady Michelle Obama, Tuesday, on June 19, 2012, in Las Vegas. Julie Jacobson/AP
President Barack Obama visits a child in the crowd after speaking at a campaign grassroots event at the Iowa state fairgrounds, in Des Moines, Iowa, on May 24, 2012. Nati Harnik/AP
President Barack Obama greets graduating students from the Science Leadership Academy at the Franklin Institute in Philadelphia, Pennsylvania, on June 12, 2012. Kevin Lamarque/Reuters
In this Aug. 17, 2011, photo, President Barack Obama speaks during a town hall meeting at Country Corner Farm Market in Alpha, Ill., during his three-day economic bus tour. Carolyn Kaster/AP
President Barack Obama boards Air Force One at Logan Airport in Boston, Tuesday, June 26, 2012, after a campaign fundraising trip. Josh Reynolds/AP