President Barack Obama signs a condolence book in memory of Chris Stevens, U.S. Ambassador to Libya, after addressing State Department employees at the State Department in Washington, D.C., Sept. 12, 2012. Secretary of State Hillary Rodham Clinton stands at left. Amb. Stevens was killed along with three others at the consulate in Benghazi, Libya yesterday. Behind the President and Secretary Clinton is a memorial to foreign service officials who have lost their lives while serving abroad. (Official White House Photo by Pete Souza)
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