Missouri Valley, Iowa

Obama on the Trail

President Barack Obama and Agriculture Secretary Tom Vilsack, right, inspect drought damaged corn on the McIntosh farm with members of the McIntosh family, Monday, Aug. 13, 2012, in Missouri Valley, Iowa, during a three day campaign bus tour through Iowa. (AP Photo/Carolyn Kaster)

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Ames, Iowa President Barack Obama walks on stage to speak for a campaign event at Iowa State University, Tuesday, Aug. 28, 2012, in Ames, Iowa. (AP Photo/Pablo Martinez Monsivais)
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)
North Las Vegas,... President Barack Obama arrives to speak at a campaign event at Canyon Springs High School, Wednesday, Aug. 22, 2012, in North Las Vegas, Nev. (AP Photo/Carolyn Kaster)
Columbus, Ohio President Barack Obama greets people inside Sloopy's diner in the Ohio State Student Union, Tuesday, Aug. 21, 2012, in Columbus, Ohio. (AP Photo/Carolyn Kaster)
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)
Dubuque, Iowa President Barack Obama is seen reflected in a TelePrompTer on stage during a campaign event at the Alliant Energy Amphitheater, Wednesday, Aug. 15, 2012, in Dubuque, Iowa, during a three day campaign bus tour through Iowa. (AP Photo/Carolyn Kaster)

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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)

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Marshalltown, Io... President Barack Obama shields the spotlight from his eyes as he works the crowd after his campaign speech, Tuesday, Aug. 14, 2012, in Marshalltown, Iowa. (AP Photo/Charles Rex Arbogast)

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Waterloo, Iowa President Barack Obama is greeted on stage by a thumbs up from Mike Dufel of Cedar Falls, Iowa, during campaign event at Waterloo Center for the Arts, Tuesday, Aug. 14, 2012, in Waterloo, Iowa, during a three day campaign bus tour through Iowa. (AP Photo/Carolyn Kaster)

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Council Bluffs, ... A light shines behind President Barack Obama as he speaks during a campaign event at Bayliss Park, Monday, Aug. 13, 2012, in Council Bluffs, Iowa, during a three day campaign bus tour through Iowa. (AP Photo/Carolyn Kaster)

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Missouri Valley,... President Barack Obama and Agriculture Secretary Tom Vilsack, right, inspect drought damaged corn on the McIntosh farm with members of the McIntosh family, Monday, Aug. 13, 2012, in Missouri Valley, Iowa, during a three day campaign bus tour through Iowa. (AP Photo/Carolyn Kaster)

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Bluffs, Iowa President Barack Obama pauses as he speaks during a campaign event at Bayliss Park, Monday, Aug. 13, 2012, in Council Bluffs, Iowa, during a three day campaign bus tour through Iowa. (AP Photo/Carolyn Kaster)

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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)

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Aurora, Colo. President Barack Obama gives the thumbs up as he heads to the limo after arriving at Buckley Air Force Base in Aurora, Colo, Wednesday, Aug, 8, 2012. (AP Photo/Jack Dempsey)

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Orlando, Fla. President Barack Obama speaks at a campaign event at Rollins College, Thursday, Aug. 2, 2012 in Orlando, Fla. Obama is campaigning in Florida and Northern Virginia today. (AP Photo/Pablo Martinez Monsivais)

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in Orlando, Fla. President Barack Obama is seen greeting patrons inside Lechonera El Barrio, a local business in Orlando, Fla., Thursday, Aug. 2, 2012. (AP Photo/Pablo Martinez Monsivais)

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Mansfield, Ohio. President Barack Obama speaks at a campaign event, Wednesday, Aug. 1, 2012, in Mansfield, Ohio. (AP Photo/Jay LaPrete)

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New Orleans, La. President Barack Obama walks over to greet people after arriving at Louis Armstrong International Airport in New Orleans, Wednesday, July 25, 2012. Obama is fundraising in New Orleans and is scheduled to speak to the National Urban League convention. (AP Photo/Susan Walsh)

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Westerville, Ohi... First lady Michelle Obama speaks during a campaign rally, Tuesday, July 24, 2012, in Westerville, Ohio. The first lady thanked volunteers for their hard work and spoke about what's at stake for Ohioans in this election. (AP Photo/Jay LaPrete)

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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)

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Ft. Myers, Fla. President Barack Obama pauses during a moment of silence for the victims of the Aurora, Colo., shooting during an event at the Harborside Event Center in Ft. Myers, Fla., Friday, July 20, 2012. Obama said the tragic movie theater shooting in Colorado that left 12 people dead is a reminder that life is fragile. (AP Photo/Susan Walsh)

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Cincinnati, Ohio... President Barack Obama speaks at a campaign event at the Cincinnati Music Hall in Cincinnati, Monday, July 16, 2012. Obama is spending the day campaigning in Cincinnati. (AP Photo/Susan Walsh)

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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)

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Virginia Beach, ... President Barack Obama speaks at a campaign event at Green Run High School in Virginia Beach, Va., Friday, July 13, 2012. Obama is spending the day in Virginia campaigning. (AP Photo/Susan Walsh)

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Poland, Ohio President Barack Obama speaks at Dobbins Elementary School in Poland, Ohio, Friday, July 6, 2012. Obama is on a two-day bus trip through Ohio and Pennsylvania. (AP Photo/Susan Walsh)

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Pittsburgh, Pa. President Barack Obama is introduced by Sen. Bob Casey, D. Pa., right, as he takes the stage at Carnegie Mellon University in Pittsburgh, Friday, July 6, 2012. Obama is on a two-day bus campaign trip through Ohio and Pennsylvania (AP Photo/Keith Srakocic)

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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)
Atlanta, Ga. Members of the audience take pictures as President Barack Obama steps to the podium at a fundraising event, Tuesday, June 26, 2012, in Atlanta. (AP Photo/David Goldman)

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Durham, N.H. President Barack Obama speaks at Oyster River High School, Monday, June 25, 2012, in Durham, N.H. (AP Photo/Carolyn Kaster)

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