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Photo by: Matt York

FBI Director Robert S. Mueller III, left, listens as Pima County Sheriff Clarence Dupnik speaks Sunday, Jan. 9, 2011, in Tucson, Ariz. Mr. Mueller came to Arizona to oversee the investigation of the shooting of U.S. Rep. Gabrielle Giffords, Arizona Democrat, who was shot in the head a day earlier during a speech at a local supermarket. (AP Photo/Matt York)

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