Las Vegas, Nevada

The Run for Presidency

President Barack Obama greets supporters as he arrives at Nellis Air Force Base on Tuesday, Aug. 21, 2012, outside Las Vegas. (AP Photo/Isaac Brekken)

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Mansfield, Ohio An overflow crowd cheers as Republican presidential candidate Mitt Romney gets on a table to speak as he campaigns at PR Machine Works in Mansfield, Ohio, Monday, Sept. 10, 2012. (AP Photo/Charles Dharapak)
Ft. Pierce, Fla. President Barack Obama is picked up and lifted off the ground by Scott Van Duzer, owner of Big Apple Pizza and Pasta Italian Restaurant, during an unannounced stop, Sunday, Sept. 9, 2012, in Ft. Pierce, Fla. (AP Photo/Pablo Martinez Monsivais)
West Palm Beach,... A young supporter listens to President Barack Obama speak at a campaign event at West Palm Beach County Convention Center, Sunday, Sept. 9, 2012, in West Palm Beach, Fla. (AP Photo/Pablo Martinez Monsivais)
Mansfield, Ohio Republican presidential candidate Mitt Romney greets an overflow crowd as he campaigns at PR Machine Works in Mansfield, Ohio, Monday, Sept. 10, 2012. (AP Photo/Charles Dharapak)
York, Pa. Vice President Joe Biden speaks during a campaign event at West York Area High School, Sunday, Sept. 2, 2012, in York, Pa. (AP Photo/Carolyn Kaster)
Tampa, Fla. Republican presidential nominee Mitt Romney shakes hands with Republican vice presidential nominee, Rep. Paul Ryan after speaking at the Republican National Convention in Tampa, Fla., on Thursday, Aug. 30, 2012.(AP Photo/Jae C. Hong)
West Lebanon, N.... Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks with reporters after stopping at Lui-Lui Restaurant on Wednesday, Sept. 5, 2012 in West Lebanon, N.H. (AP Photo/Evan Vucci)
Charlotte, N.C. Vice President Joe Biden and President Barack Obama wave to the delegates at the conclusion of President Obama's speech at the Democratic National Convention in Charlotte, N.C., on Thursday, Sept. 6, 2012. (AP Photo/J. Scott Applewhite)
Orange City, Iow... A volunteer for Republican presidential candidate, former Massachusetts Gov. Mitt Romney celebrates after firing a t-shirt gun during a campaign rally, Friday, Sept. 7, 2012, in Orange City, Iowa. (AP Photo/Evan Vucci)
Portsmouth, N.H. President Barack Obama and first lady Michelle Obama shake hands at a campaign event at Strawbery Banke Museum in Portsmouth, N.H., Friday, Sept. 7, 2012. (AP Photo/Carolyn Kaster)
Sparks, Nev. Republican vice presidential candidate, Rep. Paul Ryan, R-Wis. greets the crowd at the Peterbilt Truck & Parts Equipment company in Sparks, Nev., Friday, Sept. 7, 2012. (AP Photo/Cathleen Allison)
Virginia Beach, ... Republican presidential nominee, former Massachusetts Gov. Mitt Romney addresses the audience at a rally with the GOP team at the Military Aviation Museum in Virginia Beach, Va., Saturday, Sept. 8, 2012. (AP Photo/Rich-Joseph Facun)
St. Petersburg, ... President Barack Obama gestures while speaking before a crowd during a campaign stop at St. Petersburg College Seminole Campus, Saturday, Sept. 8, 2012, in St. Petersburg, Fla. (AP Photo/Pablo Martinez Monsivais)
Portsmouth, Ohio Vice President Joe Biden gestures as he speaks at a campaign event at Portsmouth High School, Sunday, Sept. 9, 2012, in Portsmouth, Ohio. (AP Photo/Carolyn Kaster)
Powell, Ohio Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks as vice presidential running mate Rep. Paul Ryan, R-Wis., listens during a campaign rally on Saturday, Aug. 25, 2012 in Powell, Ohio. (AP Photo/Evan Vucci)
Commerce Townshi... Republican presidential candidate, former Massachusetts Gov. Mitt Romney, left, and his vice presidential running mate, Rep. Paul Ryan, R-Wis., greet supporters during a campaign event at the Long Family Orchard Farm and Cider Mill in in Commerce Township, Mich., Friday, Aug. 24, 2012, (AP Photo/Paul Sancya)
Tampa, Fla. President Barack Obama speaks during an interview with The Associated Press at the White House, Thursday, Aug. 23, 2012, in Washington. Obama talked about the presidential race and Republican challenger Mitt Romney in the exclusive AP interview before heading off to a long weekend with his family at Camp David, the secluded presidential retreat in the Maryland mountains. His comments come ahead of the GOP convention opening Aug. 27, 2012, in Tampa, Fla. (AP Photo/Carolyn Kaster)
Hobbs, N.M. Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks during a campaign event at Watson Truck and Supply, Thursday, Aug. 23, 2012, in Hobbs, N.M. (AP Photo/Evan Vucci)
Fayetteville, N.... Republican vice presidential candidate, Rep. Paul Ryan, R-Wis. refers to a list of deceased enlisted men during a campaign event at Partnership for Defense Innovation in Fayetteville, N.C., Thursday, Aug. 23, 2012. (AP Photo/Sara D. Davis)
Raleigh, N.C. Republican vice presidential candidate, Rep. Paul Ryan, R-Wis., holds a baby during a campaign event at SMT, Inc. in Raleigh, N.C., Wednesday, Aug. 22, 2012. (AP Photo/Gerry Broome)
North Las Vegas,... President Barack Obama talks with Lori Elizabeth Henrickson, an Earth Science teacher at Del Webb Middle School as he visits with teachers at Canyon Springs High School, Wednesday, Aug. 22, 2012, in North Las Vegas, Nev. (AP Photo/Carolyn Kaster)
Midland, Texas Republican presidential candidate, former Massachusetts Gov. Mitt Romney boards his plane for a campaign stop in Iowa, Wednesday, Aug. 22, 2012, in Midland, Texas. (AP Photo/Evan Vucci)
Roanoke, Va. Republican vice-presidential candidate, Rep. Paul Ryan, R-Wis., left, listens to small business owner Chris McMurray, during a rally at a hardware store in Roanoke, Va., Wednesday, Aug. 22, 2012. ( AP Photo/Steve Helber)
Minneapolis, Min... Vice President Joe Biden left talks with members of the South High school football team after their practice in Minneapolis, Tuesday Aug. 21, 2012. (AP Photo/The Star Tribune, Jerry Holt, Pool)
New Orleans, La. Republican presidential candidate, former Massachusetts Gov. Mitt Romney arrives at Louis Armstrong New Orleans International Airport in New Orleans, Tuesday, Aug. 21, 2012, prior to departing for fundraising events in Texas. (AP Photo/Evan Vucci)
Las Vegas, Nevad... President Barack Obama greets supporters as he arrives at Nellis Air Force Base on Tuesday, Aug. 21, 2012, outside Las Vegas. (AP Photo/Isaac Brekken)
Carnegie, Pa. Republican vice presidential candidate, Rep. Paul Ryan, R-Wis. shakes hands after speaking a campaign rally at Beaver Steel in Carnegie, Pa., Tuesday, Aug. 21, 2012. (AP Photo/John Heller)
Manchester, N.H.... Republican presidential candidate, former Massachusetts Gov. Mitt Romney, right, and vice presidential running mate Rep. Paul Ryan, R-Wis., left, shake hands as they arrive to a campaign rally, Monday, Aug. 20, 2012 ,in Manchester N.H. (AP Photo/Evan Vucci)
North Canton, Oh... Republican vice presidential candidate Rep. Paul Ryan, R-Wis. speaks at a campaign stop at Walsh University in North Canton, Ohio, Thursday, Aug. 16, 2012. (AP Photo/Phil Long)
Windham, N.H. President Barack Obama wipes sweat from his forehead while speaking to supporters during a campaign stop in Windham, N.H., Saturday, Aug. 18, 2012. (AP Photo/Winslow Townson)
Nantucket, Mass. Republican presidential candidate, former Massachusetts Gov. Mitt Romney makes a stop at Millie's to talk with voters before attending a fundraising event on Saturday, Aug. 18, 2012 in Nantucket, Mass. (AP Photo/Evan Vucci)
Oskaloosa, Iowa President Barack Obama speaks during a campaign event at the Nelson Pioneer Farm & Museum, Tuesday, Aug. 14, 2012, in Oskaloosa, Iowa, during a three day campaign bus tour through Iowa. (AP Photo/Carolyn Kaster)
Miami, Fla. Republican presidential candidate, former Massachusetts Gov. Mitt Romney greets supporters at a campaign event at El Palacio de los Jugos in Miami, Monday, Aug. 13, 2012. (AP Photo/Mary Altaffer)
Grand Junction C... President Barack Obama speaks to supporters at a campaign stop in Grand Junction Colo., Wednesday, August 8, 2012. (AP Photo/William Woody)
Mooresville, N.C... Republican vice presidential candidate Rep. Paul Ryan, left, R-Wis., applauds as his running mate, Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks during a campaign event at the NASCAR Technical Institute, Sunday, Aug. 12, 2012, in Mooresville, N.C. (AP Photo/Mary Altaffer)
Mansfield, Ohio President Barack Obama speaks at a campaign event, Wednesday, Aug. 1, 2012, in Mansfield, Ohio. (AP Photo/Jay LaPrete)
Ashland, Va. Republican Presidential candidate, Mitt Romney, left, and his running mate, Rep. Paul Ryan, R-Wis., look at the crowd upon arriving at a campaign rally at Randolph-Macon College in Ashland, Va., Saturday, Aug. 11, 2012. ( AP Photo/Steve Helber)
Reno, Nev. President Barack Obama looks back to applaud those that served during his remarks at the 113th National Convention of the VFW in Reno, Nev., Monday, July 23, 2012. (AP Photo/Susan Walsh)
Bow, N.H. Republican presidential candidate, former Massachusetts Gov. Mitt Romney hugs supporters after he spoke about the shootings in Colorado at an event in Bow, N.H., Friday, July 20, 2012. (AP Photo/Charles Dharapak)
Glenn Allen, Va. President Barack Obama addresses a crowd in the pouring rain during a campaign stop at Walkerton Tavern in Glenn Allen, Va., Saturday, July 14, 2012. ( AP Photo/Steve Helber)
Washington D.C. With the Capitol in the background, Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks about the Supreme Court's health care ruling, Thursday, June 28, 2012, in Washington. (AP Photo/Charles Dharapak)
Las Vegas, Nev. Republican vice presidential candidate Rep. Paul Ryan R-Wis., speaks during a campaign event at Palo Verde High School on Tuesday, Aug. 14, 2012 in Las Vegas. (AP Photo/David Becker)
North Canton, Oh... Republican vice presidential candidate, Rep. Paul Ryan, R-Wis. listens to the crowd response during his speech at a campaign stop at Walsh University in North Canton, Ohio, Thursday, Aug. 16, 2012. (AP Photo/Phil Long)
Columbus, Ohio Vice President Joe Biden campaigns at the Plumbers & Pipefitters Local Union 189 Thursday, July 19, 2012, in Columbus, Ohio. (AP Photo/Jay LaPrete)
Oak Harbour, Ohi... President Barack Obama gets a high-five as he greets children outside the Kozy Corner diner in Oak Harbour, Ohio, Thursday, July 5, 2012. Obama is on a two-day bus trip through Ohio and Pennsylvania. (AP Photo/Susan Walsh)
Stratham, N.H. Republican presidential candidate, former Massachusetts Gov. Mitt Romney and his wife Ann arrive for a campaign stop at the Scamman Farm in Stratham, N.H., Friday, June 15, 2012. (AP Photo/Evan Vucci)
Greer, S.C Republican presidential candidate, former Massachusetts Gov. Mitt Romney writes on a white board as he talks about Medicare during a news conference at Spartanburg International Airport, Thursday, Aug. 16, 2012, in Greer, S.C. (AP Photo/Evan Vucci)
Durham, N.H. President Barack Obama speaks at Oyster River High School, Monday, June 25, 2012, in Durham, N.H. (AP Photo/Carolyn Kaster)