Bill Clinton

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Former President Bill Clinton speaks at Georgetown University in Washington, Wednesday, April 30, 2014. Clinton, who graduated from Georgetown's School of Foreign Service in 1968, gave the second in a series of lectures exploring the people, events, lessons and guiding principles that have shaped his career in public service. (AP Photo)

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Former President Bill Clinton speaks at the 25th Anniversary Rainforest Fund benefit concert at Carnegie Hall on Thursday, April 17, 2014 in New York. (Photo by Evan Agostini/Invision/AP)

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Former President Bill Clinton and actor Kevin Spacey on stage together at the 25th Anniversary Rainforest Fund benefit concert at Carnegie Hall on Thursday, April 17, 2014 in New York. (Photo by Evan Agostini/Invision/AP)

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Former President Bill Clinton speaks during the Civil Rights Summit on Wednesday, April 9, 2014, in Austin, Texas. (AP Photo/Jack Plunkett)

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Former President Bill Clinton speaks during the Civil Rights Summit on Wednesday, April 9, 2014, in Austin, Texas. Clinton is using the 50th anniversary of the Civil Rights Act to criticize efforts in several states to create new restrictions for voters. (AP Photo/Jack Plunkett)

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Former President Bill Clinton speaks during the Civil Rights Summit on Wednesday, April 9, 2014, in Austin, Texas. Clinton is using the 50th anniversary of the Civil Rights Act to criticize efforts in several states to create new restrictions for voters. (AP Photo/Jack Plunkett)

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Former President Bill Clinton speaks during the Civil Rights Summit on Wednesday, April 9, 2014, in Austin, Texas. Clinton used the 50th anniversary of the Civil Rights Act to criticize efforts in several states to restrict voting, saying they threaten to roll back half a century of progress. (AP Photo/Jack Plunkett)