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Former U.S. Rep. Gabrielle Giffords (D-Ariz.) is escorted
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Former U.S. Rep. Gabrielle Giffords (D-Ariz.) is escorted down the hall by Rep. Debbie Wasserman Schultz (D-Fla.) after she resigned from the House of Representatives on Capitol Hill in Washington, D.C. Giffords resigned from Congress to focus on her recovery from a gunshot wound to the head she received last year from a lone gunman in Arizona. (Jan. 25, 2012)(Credit: Getty Images)

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Rep. Gabrielle Giffords

Arizona Rep. Gabrielle Giffords was shot in the head when an assailant opened fire while the lawmaker met with constituents in Tucson on Jan. 8, 2011. Six people were killed in the shooting. She resigned from the House of Representatives on Jan. 25, 2012, to focus on her recovery.