WASHINGTON, DC - SEPTEMBER 12: The American flag stands at half-staff at the U.S. Capitol September 12, 2012 in Washington, DC. The flag was lowered for U.S. ambassador to Libya J. Christopher Stevens and three other embassy employees who were killed when the embassy in Benghazi was attacked by a mob potentially angered by an American-made video mocking Islam's founding prophet. (Photo by Mark Wilson/Getty Images)
