Bill Clinton

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Mrs. Clinton, former President Bill Clinton and U.S. Sen. Tom Harkin work the grill during the 37th annual "steak fry" fundraiser. Mrs. Clinton teased the crowd about her plans, saying her focus is on her future grandchild and "then, of course, there is that other thing."

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Former President Bill Clinton speaks during U.S. Sen. Tom Harkin's annual fundraising Steak Fry, Sunday, Sept. 14, 2014, in Indianola, Iowa. (AP Photo/Charlie Neibergall)

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Then-Secretary of State Hillary Rodham Clinton, and former President Bill Clinton, listen to speakers in Washington in this Jan. 14, 2011, file photo. (AP Photo/Carolyn Kaster, File)

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Former Presidents Bill Clinton, left, and George W. Bush, laugh while participating in the Presidential Leadership Scholars Program Launch, Monday, Sept. 8, 2014, at The Newseum in Washington. The two are launching a new scholars program at four presidential libraries, aiming to help academics and business leaders learn more about presidential leadership. (AP Photo/Jacquelyn Martin)

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Former U.S. Secretary of State Hillary Rodham Clinton, and former President Bill Clinton, listen to speakers in Washington, Jan. 14, 2011. (Associated Press) ** FILE **

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David Brock, a former critic and later defender of Bill and Hillary Clinton, will head the Citizens for Responsibility and Ethics. (associated press)

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This undated photo, supplied by Warner Twelve, shows Mark J. Penn, the powerhouse pollster-consultant whose clients have included Bill and Hillary Clinton and Bill Gates and who coined the political demographic "soccer moms," who is working on a book on "small trends that are making a big difference," publisher Warner Twelve announced Tuesday, June 27, 2006. Warner will publish "Microtrends" in the fall of 2007.(AP Photo/Warner Twelve

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Former Secretary of State Hillary Rodham Clinton's presidential run could be complicated due to her husband, former President Bill Clinton. (associated press)

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Former President Bill Clinton says states should experiment with legalizing marijuana. (AP Photo/Brennan Linsley)

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Easy Choices: Former President Bill Clinton and Hillary Rodham Clinton have developed relationships with philanthropic and corporate interests that sometimes intertwine with their political ambitions. (Associated Press Photographs)

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Former President Bill Clinton gestures during a televised conversation hosted by Bloomberg TV titled "A New Competitive Era: America in the World," on the final day of the annual gathering of the Clinton Global Initiative America, at the Sheraton Downtown, in Denver, Wednesday, June 25, 2014. (AP Photo/Brennan Linsley)