A CBS News poll says that 57% of those surveyed reject a connection between the strident tone of recent political debate and the attack that killed six and seriously wounded Rep. Gabrielle Giffords. However, the results differed sharply depending on respondents' political identifications.A sizable majority of Americans said they did not believe that harsh political rhetoric was the reason a gunman opened fire over the weekend in Tucson, killing six and wounding 14, including Rep.