Former Arizona Rep. Gabrielle Giffords listens as her husband, retired astronaut Mark Kelly speaks on Capitol Hill, in Washington, Tuesday, April 16, 2013, during a ceremony to honor Gabriel "Gabe" Zimmerman. Zimmerman was Giffords' outreach director until he was killed in the January 2011 shooting rampage in Tucson where Giffords was wounded. (AP Photo/Jose Luis Magana)

Associated Press
Former Arizona Rep. Gabrielle Giffords listens as her husband, retired astronaut Mark Kelly speaks on Capitol Hill, in Washington, Tuesday,  April 16, 2013, during a ceremony to honor Gabriel "Gabe" Zimmerman.  Zimmerman was Giffords' outreach director until he was killed in the January 2011 shooting rampage in Tucson where Giffords was wounded.  (AP Photo/Jose Luis Magana)
Former Arizona Rep. Gabrielle Giffords listens as her husband, retired astronaut Mark Kelly speaks on Capitol Hill, in Washington, Tuesday, April 16, 2013, during a ceremony to honor Gabriel "Gabe" Zimmerman. Zimmerman was Giffords' outreach director until he was killed in the January 2011 shooting rampage in Tucson where Giffords was wounded. (AP Photo/Jose Luis Magana)
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