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DAVID GREENE, HOST:
An international conference in Morocco this week will focus on the future of Syria's opposition. Secretary of State Hillary Clinton was due to attend but she is ill, so her deputy, William Burns, will be going in her place. Among the items that will be discussed is a notable move by the State Department. It's adding a Syrian rebel group to a terrorism list today. This is part of an effort by the United States to marginalize extremists and boost the secular opposition in Syria.