Hillary Rodham Clinton

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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)

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**FILE** President Obama has lunch with former Secretary of State Hillary Rodham Clinton on the patio outside the Oval Office on July 29, 2013. (Chuck Kennedy/White House)

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President Barack Obama and Secretary of State Hillary Rodham Clinton speak together sitting at a picnic table April 9, 2009, on the South Lawn of the White House. (Official White House Photo by Pete Souza)