Text: Consider the results of another poll, this one from 1964, in which Louis Harris found that RFK's presence on a Democratic ticket would gravely hurt the party's chances in the South and border states, among businessmen, and among fence-sitters in both parties.
Entailment: They took into account the probability of the ticket being changed could have hurt the party at the time.
Contradiction: They did not consider any polls til the election was long over.