The flap over Elizabeth Warren's claim of Native American heritage does not seem to be hurting her campaign for the U.S. Senate.  A new Suffolk University/7 News poll has Warren in a virtual dead heat with Senator Scott Brown.  The poll shows 47% in favor of Warren, and 48% in favor of Brown, with a margin of error of plus or minus 4%.  Ony 5% of those polled say they were undecided.