Remember, Bradley ran for governor before the days of all of the polling that we have today. Sure there are some who will fall into this category, but it must be a very few. I doubt that thousands of people are consistantly fooling the polsters ALL of the time in ALL of the polls that are out their ALL the way through the campaign. Bradly also did not register a googleplex of new voters.
But Wilder didn't, nor did Patrick, Steele or Blackwell.
Nor did Patrick, Steele or Blackwell overpoll outside of the MoE (or overpoll at all in Patrick's case.)