Hillary Rodham Clinton

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Hillary Rodham Clinton prepares to receive the Order of Lincoln Award from Illinois Gov. Pat Quinn at the Field Museum in Chicago, Saturday, May 3, 2014. (AP Photo/Paul Beaty)

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As attendees take cell phone photographs of her, former Secretary of State Hillary Rodham Clinton laughs as she arrives to attend a speech by her husband, former President Bill Clinton, Wednesday, April 30, 2014, at Georgetown University in Washington. At right is Georgetown President John DeGioia. (AP Photo)

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FILE - In this Jan. 24, 2013, file photo, then-Secretary of State Hillary Rodham Clinton huddles with Sen. John McCain, R-Ariz., on Capitol Hill in Washington. McCain and Clinton share a friendship forged in the Senate, on fact-finding trips around the globe and over vodka shots in Estonia. He's a former Republican presidential nominee. She could be the next Democratic presidential nominee. And lately, the Clintons and McCains seem to have embraced each other, offering up their families' working relationship as an example of wlkays political leaders can overcome the partisan divide. (AP Photo/J. Scott Applewhite, File)

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Former Secretary of State Hillary Rodham Clinton holds up UConn Huskies outfits given to her by university president Susan Herbst for Clinton's future grandchild at the end of a speaking appearance at the Edmund Fusco Contemporary Issues Forum at the University of Connecticut, Wednesday, April 23, 2014, in Storrs, Conn. (AP Photo/Jessica Hill)