800 adults were interviewed 10/21/08 and 10/22/08. Of them, 716 were registered to vote. Of them, 620 were determined by SurveyUSA to be likely to vote in the 11/04/08 general election. The McCain campaign may believe that it can only win the White House if it wins PA, and cannot win the White House if it loses PA. The state's 21 electoral votes have a prominence that is possibly greater than in any previous electio