Gabrielle Giffords, Mark Kelly remember staffer killed in Tucson

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Gabrielle Giffords, Mark Kelly remember staffer killed in Tucson
Former Rep. Gabrielle Giffords and her husband Mark Kelly remember Gabe Zimmerman - the Arizona Democrat's former staffer who was killed during an assassination attempt in 2011 - during a ceremony dedicating in his name a U.S. Capitol room.
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