As individuals, Congresswoman Gabrielle Giffords and her husband, astronaut Mark Kelly, showed Americans how optimism, an adventurous spirit, and a call to service can help change the world. As a couple, they became a national example of the healing power to be found in deeply shared love and courage. Their arrival in the world spotlight came under the worst of circumstances. On January 8, 2011, while meeting with her constituents in Tucson, Arizona,...