Bill Clinton

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President Obama stands with former presidents George W. Bush, Bill Clinton, George H.W. Bush, and Jimmy Carter at the dedication of the George W. Bush presidential library on the campus of Southern Methodist University in Dallas, Thursday, April 25, 2013. (AP Photo/Charles Dharapak)

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President Barack Obama stands with former presidents, from second from left, George W. Bush, Bill Clinton, George H.W. Bush, and Jimmy Carter at the dedication of the George W. Bush presidential library on the campus of Southern Methodist University in Dallas, Thursday, April 25, 2013. (AP Photo/Charles Dharapak)

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President Barack Obama, and former presidents, from second from left, George W. Bush, Bill Clinton, George H.W. Bush and Jimmy Carter arrive for the dedication of the George W. Bush Presidential Center ,Thursday, April 25, 2013, in Dallas. (AP Photo/David J. Phillip)

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Former president George W. Bush, left, shakes hands with former president William J. Clinton during the dedication of the George W. Bush Presidential Center Thursday, April 25, 2013, in Dallas. (AP Photo/David J. Phillip)

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Former president George W. Bush, left, shakes hands with former president William J. Clinton during the dedication of the George W. Bush Presidential Center Thursday, April 25, 2013, in Dallas. (AP Photo/David J. Phillip)

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From left, President Barack Obama, former president George W. Bush, former president William J. Clinton former President George H.W. Bush and former president Jimmy Carter arrive for the dedication of the George W. Bush Presidential Center Thursday, April 25, 2013, in Dallas. (AP Photo/David J. Phillip)

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President Barack Obama stands with former presidents George W. Bush, Bill Clinton, George H.W. Bush, and Jimmy Carter at the dedication of the George W. Bush presidential library on the campus of Southern Methodist University in Dallas, Thursday, April 25, 2013. (AP Photo/Charles Dharapak)

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Former President Bill Clinton, left, former first lady Hillary Rodham Clinton, second left, former President Jimmy Carter, second right, and Rosalynn Carter are seated on stage at the George W. Bush presidential library on the campus of Southern Methodist University in Dallas, Thursday, April 25, 2013. (AP Photo/Charles Dharapak)

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Bill Clinton tweets from the opening of the former president George W. Bush's presidential library. (Image: Twitter)

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A screen grab of former President Bill Clinton's faux Twitter account for comedian Stephen Colbert.

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**FILE** President Obama is greeted by then-Secretary of State Hillary Rodham Clinton and former President Bill Clinton for his ceremonial swearing-in on Capitol Hill in Washington on Jan. 21, 2013, during the 57th Presidential Inauguration. (Associated Press)