Bill Clinton

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Former South African President Nelson Mandela, right, with former U.S. President Bill Clinton, left, during the Nelson Mandela Annual Lecture in honour of Mandela who turned 87 Monday in Johannesburg, South Africa, Tuesday, July 19, 2005. (AP Photo/Themba Hadebe)

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President Bill Clinton, left, and Nelson Mandela listen during Fourth of July ceremonies in Philadelphia during which Clinton presented the Philadelphia Liberty Medal to the African National Congress president and South African President F.W. de Klerk Sunday, July 4, 1993. (AP Photo/Greg Gibson)

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President Bill Clinton's cat Socks holds court in the White House briefing room. (White House photo)

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Former Secretary of State Hillary Rodham Clinton walks past the Presidential seal in the East Room of the White House in Washington, Wednesday, Nov. 20, 2013, after a ceremony where President Barack Obama awarded the Presidential Medal of Freedom to former President Bill Clinton and others. (AP Photo/Jacquelyn Martin)

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President Barack Obama, first lady Michelle Obama, former President Bill Clinton and his wife former Secretary of State Hillary Rodham Clinton, pause during a wreath laying ceremony in honor of President John F. Kennedy, Wednesday, Nov. 20, 2013, at Arlington National Cemetery in Arlington, Va. Friday will mark the 50th anniversary of the Kennedy assassination. (AP Photo/Pablo Martinez Monsivais)