In this March 4, 2015, file photo, former U.S. Rep. Gabby Giffords, D-Ariz., speaks on Capitol Hill in Washington, about bipartisan legislation on gun safety. (AP Photo/Carolyn Kaster, File)
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In this March 4, 2015, file photo, former U.S. Rep. Gabby Giffords, D-Ariz., speaks on Capitol Hill in Washington, about bipartisan legislation on gun safety. (AP Photo/Carolyn Kaster, File)
