Christina-Taylor Green was beautiful, precocious and popular, a member of her elementary school's student council and the only girl on her Little League team. Born on 9/11/2001, it was perhaps no surprise that she harbored aspirations of becoming a politician--thus her presence at the political rally that fateful day in Tucson last January. Congressman Gabrielle Giffords was severely wounded in the gunman's splay of bullets; six others were killed,...