Barack Obama

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President Obama speaks during a Rural Economic Forum on Aug. 16, 2011, at Northeast Iowa Community College in Peosta, Iowa, during his three-day bus tour devoted to the economy. (Associated Press)

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President Obama stops for breakfast on Aug. 16, 2011, with small business owners at Rausch's Cafe in Guttenberg, Iowa, during his three-day bus tour devoted to the economy. (Associated Press)

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President Obama speaks Aug. 15, 2011, during a town hall meeting at Lower Hannah's Bend Park in Cannon Falls, Minn., during his three-day bus tour devoted to the economy. (Associated Press)

Ryan Rhodes (right) and another member of the Iowa Tea Party Revolution (left) speak Aug. 15, 2011, to President Obama at a town hall meeting in Decorah, Iowa, during the president's three-day economic bus tour. (Associated Press)

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President Barack Obama mimics calling on a phone during a town hall event at Lower Hannah's Bend Park in Cannon Falls, Minn., Monday, Aug. 15, 2011. (AP Photo/Nati Harnik)

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President Barack Obama waves before boarding his bus after having lunch and greeting people at The Old Market Deli, Monday, Aug. 15, 2011, in Cannon Falls, Minn., during his three-day economic bus tour. (AP Photo/Carolyn Kaster)

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President Obama speaks during a town hall meeting at Lower Hannah's Bend Park in Cannon Falls, Minn., on Aug. 15, 2011. (Associated Press)

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President Obama waves as he boards Air Force One at Andrews Air Force Base, Md., on Aug. 15, 2011, for a three-day bus tour through Minnesota, Iowa and Illinois. (Associated Press)

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President Obama will hold a town-hall meeting in Minnesota on Monday and then travel by bus to Iowa before concluding his Midwest trip in Illinois. The White House is billing the trip as an "economic bus tour," but Republicans are blasting it as a taxpayer-funded campaign swing. (Associated Press)

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** FILE ** President Barack Obama leaves the Oval Office of the White House in Washington Saturday, Aug. 13, 2011, on his way to play golf at Andrews Air Force Base. (AP Photo/Jacquelyn Martin)

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President Obama shakes hands on the tarmac at John F. Kennedy International Airport Thursday on his way to fundraisers in New York. (Associated Press)

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Mr. Obama speaks at Johnson Controls Inc. in Holland, Mich., earlier Thursday, saying S&P's downgrade of the U.S. credit rating could have been avoided if Congress weren't "dysfunctional." (Associated Press)

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White House image of President Obama during the dignified transfer of remains of troops killed in Afghanistan, Dover AFB, August 9, 2011.

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President Obama greets supporters on the tarmac of the Grand Rapids, Mich., airport on Aug. 11, 2011. (Associated Press)

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President Obama gestures while speaking about the role innovative technologies play in fuel economy standards and the economy on Aug. 11, 2011, at Johnson Controls Inc. in Holland, Mich. (Associated Press)

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President Obama arrives at the White House on Aug. 9, 2011, after making an unannounced trip to Dover Air Force Base, in Dover, Del., to pay tribute to the 30 U.S. troops killed over the weekend in Afghanistan. (Associated Press)

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President Obama walks with Col. Mark Camerer, the 436th Airlift Wing Commander, upon the president's arrival at Dover Air Force Base in Dover, Del., on Aug. 9, 2011. (Associated Press)

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Col. Mark Camerer (left), commander of the 436th Airlift Wing at Dover Air Force Base in Delaware, greets President Obama on Tuesday, Aug. 9, 2011. Mr. Obama was expected to meet privately with families of 30 Americans killed over the weekend in an International Security Assistance Force helicopter crash in eastern Afghanistan while supporting Operation Enduring Freedom. (AP Photo/Carolyn Kaster)

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President Obama speaks in the State Dining Room of the White House in Washington on Monday, Aug. 8, 2011. (AP Photo/Carolyn Kaster)

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A currency trader works in front of a TV showing U.S. President Barack Obama at the Korea Exchange Bank headquarters in Seoul, South Korea, Tuesday, Aug. 9, 2011. Asian equity markets were sharply down early Tuesday as investors fearing a possible global economic slowdown continued to flee stocks. (AP Photo/Ahn Young-joon)