(121004) -- DENVER, Oct. 4, 2012 (Xinhua) -- U.S. President Barrack Obama attends the first presidential debate at Denver University, Denver, Colorado, the United States, Oct. 3, 2012. U.S. President Barack Obama and Republican nominee Mitt Romney on Wednesday night fought head-to-head here over economy, the top issue on the campaign trail, among several domestic issues in their first face-to-face debate. (Xinhua/Zhang Jun)(ctt)
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