Bill Clinton

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President Barack Obama is joined by former President Bill Clinton, Sen. Jeanne Shaheen, D-N.H., and Gov. John Lynch, D-N.H. at a campaign event, Sunday, Nov. 4, 2012, in Concord, N.H. (AP Photo/Jim Cole)

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President Barack Obama walks to the podium as former President Bill Clinton waves to the crowd at right during a campaign event in the State Capitol Square, Sunday, Nov. 4, 2012, in Concord, N.H. (AP Photo/Carolyn Kaster)

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From left to right, former President Bill Clinton, Sen. Jeanne Shaheen, D-N.H., New Hampshire Gov. John Lynch, and President Barack Obama, wave on stage together during a campaign event at Capitol Square, Sunday, Nov. 4, 2012, in Concord, N.H. (AP Photo/Pablo Martinez Monsivais)

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President Barack Obama, right, shakes hands with former President Bill Clinton, left, as New Hampshire Gov. John Lynch, center, watches on stage together during a campaign event at Capitol Square, Sunday, Nov. 4, 2012, in Concord, N.H. (AP Photo/Pablo Martinez Monsivais)

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President Obama (right) and former President Bill Clinton shake hands onstage during a campaign event at Capitol Square in Concord, N.H., on Sunday, Nov. 4, 2012. (AP Photo/Pablo Martinez Monsivais)

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President Obama (center), in the final hours of a four-state campaign day, is joined by former President Bill Clinton (left) and former Virginia Gov. Tim Kaine, who is running for the U.S. Senate, at a rally at Jiffy Lube Live Arena in Bristow, Va., late on Saturday night, Nov. 3, 2012. (AP Photo/J. Scott Applewhite)

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** FILE ** Former President Bill Clinton addresses the crowd during a rally for President Barack Obama at Palm Beach State College Friday, Nov. 2, 2012, in Lake Worth, Fla. (AP Photo/Palm Beach Post, Lannis Waters)

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A"Vote Early" sign in displayed as former President Bill Clinton speaks at a President Barack Obama campaign rally, Monday, Oct. 29, 2012, in Youngstown, Ohio. (AP Photo/Matt Rourke)

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Former President Bill Clinton greets singer/songwriter Bruce Springsteen at a campaign event for President Barack Obama, Thursday, Oct. 18, 2012, in Parma, Ohio. (AP Photo/Tony Dejak)

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Former President Bill Clinton laughs with singer Bruce Springsteen during a campaign event for President Obama in Parma, Ohio, on Thursday. (Associated Press)

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Former President Bill Clinton (right) greets singer-songwriter Bruce Springsteen at a campaign event for President Obama on Thursday, Oct. 18, 2012, in Parma, Ohio. (AP Photo/Tony Dejak)

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Rep. Mark Critz, Pennsylvania Democrat, talks to a crowd at one of his campaign rallies before former President Bill Clinton addressed them on Thursday, Oct. 4, 2012 in Vanport, Pa. (AP Photo/Keith Srakocic)