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Photo by: Cheryl Evans

Rep. Gabrielle Giffords and her husband, retired Navy Capt. Mark Kelly, walk on the Davidson Canyon Gabe Zimmerman Memorial Trailhead on Saturday, Jan. 7, 2012, to pay tribute to Zimmerman, who was killed a year ago during the Tucson shooting. Zimmerman was the director of community outreach for Mrs. Giffords. (AP Photo/The Arizona Republic, Cheryl Evans)

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