Hillary Rodham Clinton

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** FILE ** U.S. Secretary of State Hillary Rodham Clinton delivers remarks at the release of the 10th edition of “To Walk the Earth in Safety” report, in the Press Briefing room at the U.S. Department of State in Washington, D.C., on Dec. 19, 2011. (State Department photo)

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Secretary of State Hillary Rodham Clinton congratulates President Barack Obama on the House vote to pass health care reform, prior to a meeting in the Situation Room of the White House, March 22, 2010. (Official White House Photo by Pete Souza)

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**FILE** President Obama stands at the podium to speak as Secretary of State Hillary Rodham Clinton steps aside during the Transfer of Remains Ceremony at Andrews Air Force Base, Md., on Sept. 14, 2012, marking the return to the United States of the remains of the four Americans killed this week in Benghazi, Libya. (Associated Press)

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** FILE ** In this Dec. 6, 2013, file photo, former Secretary of State Hillary Rodham Clinton speaks on Capitol Hill in Washington. (AP Photo/Susan Walsh, File)

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Former President Bill Clinton swore in newly minted New York Mayor Bill de Blasio, accompanied by Hillary Rodham Clinton who sported a snappy new hairdo. (ASSOCIATED PRESS)

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** FILE ** This Nov. 11, 2009, file photo shows then-Secretary of State Hillary Rodham Clinton walking with a then-Deputy Chief of Staff Jake Sullivan in Singapore. Last summer, Sullivan was traveling with his boss, Hillary Rodham Clinton, when he suddenly disappeared during a stop in Paris. He showed up again a few days later, rejoining Clinton's traveling contingent in Mongolia. (AP Photo/Ng Han Guan, File)

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Former U.S. Secretary of State Hillary Rodham Clinton, former U.S. President Bill Clinton and their daughter Chelsea arrive for the memorial service for former South African president Nelson Mandela at the FNB Stadium in Soweto, near Johannesburg, South Africa, Tuesday Dec. 10, 2013. (AP Photo/Peter Dejong)