Obama last year said the United States had a "moral obligation" to stop the killing in Sudan's Darfur region, calling it "a stain on our souls." He called for the U.S. to help establish a no-fly zone to prevent Sudan's air force from attacking civilians, a position also backed by fellow Democratic senators Joe Biden and Hillary Rodham Clinton. However, according to Joel Charney with Refugees International, "Enforcing a no-fly zone is tantamount to declaration of war on Sudan.

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