Barack Obama

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President Barack Obama speaks during a campaign rally at the Value City Arena in Columbus, Ohio on Saturday, May 5, 2012. (AP Photo/Columbus Dispatch, Brooke LaValley)

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President Barack Obama speaks during a campaign rally at Ohio State University in Columbus, Ohio, Saturday, May 5, 2012. (AP Photo/Mark Duncan)

President Barack Obama speaks to students and parents at Washington-Lee High School in Arlington, Va., Friday, May 4, 2012, about his efforts to prevent interest rates from doubling on federal student loans. (AP Photo/J. Scott Applewhite)

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President Barack Obama speaks to students and parents at Washington-Lee High School in Arlington, Va., Friday, May 4, 2012, about his efforts to prevent interest rates from doubling on federal student loans. (AP Photo/J. Scott Applewhite)

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President Barack Obama speaks at a celebration of Cinco de Mayo in the Rose Garden of the White House in Washington, Thursday, May 3, 2012. (AP Photo/Carolyn Kaster)

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President Barack Obama is greeted by Lt. Gen. Curtis "Mike" Scaparrotti, and U.S. Ambassador to Afghanistan Ryan Crocker as he steps off Air Force One at Bagram Air Field in Afghanistan, Tuesday, May 1, 2012. (AP Photo/Charles Dharapak)

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** FILE ** Obama campaign strategist Robert Gibbs. ("Fox News Sunday" via Associated Press)

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FILE - In this Oct. 28, 2008 file photo, a Secret Service agent stands near then presidential candidate Barack Obama, background, at a rally in Norfolk, Va. Moving swiftly, the Secret Service forced out three agents Wednesday, April 18, 2012 in a prostitution scandal that has embarrassed President Obama. A senior congressman welcomed the move to hold people responsible for the tawdry episode but warned "it's not over." (AP Photo/Jae C. Hong, File)