FILE - In a Tuesday, June 12, 2012 file photo, in an election to fill former Rep. Gabrielle Giffords, left, D-Ariz., congressional seat, Democratic candidate Ron Barber, right, celebrates a victory with Giffords and supporters at a post election event, in Tucson, Ariz. Giffords and her husband on Tuesday, Jan. 8, 2014 launched a political action committee aimed at curbing gun violence as Tucson residents paused to mark the anniversary of the shooting rampage there. (AP Photo/Ross D. Franklin, File)

Associated Press
FILE - In a Tuesday, June 12, 2012 file photo, in an election to fill former Rep. Gabrielle Giffords, left, D-Ariz., congressional seat, Democratic candidate Ron Barber, right, celebrates a victory with Giffords and supporters at a post election event, in Tucson, Ariz. Giffords and her husband on Tuesday, Jan. 8, 2014 launched a political action committee aimed at curbing gun violence as Tucson residents paused to mark the anniversary of the shooting rampage there. (AP Photo/Ross D. Franklin, File)
FILE - In a Tuesday, June 12, 2012 file photo, in an election to fill former Rep. Gabrielle Giffords, left, D-Ariz., congressional seat, Democratic candidate Ron Barber, right, celebrates a victory with Giffords and supporters at a post election event, in Tucson, Ariz. Giffords and her husband on Tuesday, Jan. 8, 2014 launched a political action committee aimed at curbing gun violence as Tucson residents paused to mark the anniversary of the shooting rampage there. (AP Photo/Ross D. Franklin, File)
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