(121114) -- WASHINGTON D.C., Nov. 14, 2012 (Xinhua) -- U.S. President Barack Obama attends a news conference at the White House in Washington D.C., capital of the United States, on Nov. 14, 2012. Obama said Wednesday that he has no evidence that the sex scandal involving David Petraeus, former chief of the Central Intelligence Agency (CIA), has had a negative impact on the U.S. national security. (Xinhua/Zhang Jun)
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