WASHINGTON, DC - SEPTEMBER 10: U.S. President Barack Obama delivers a prime time address from the Cross Hall of the White House on September 10, 2014 in Washington, DC. Vowing to target the Islamic State with air strikes "wherever they exist", Obama pledged to lead a broad coalition to fight IS and work with "partner forces" on the ground in Syria and Iraq. (Photo by Saul Loeb-Pool/Getty Images)
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