This discussion reminds me of the story "Franchise" by Asimov where they get polling down to such a science that they only need one "vote" (though a vote in this case is answering a bunch of questions not seemingly related to the actual election itself) where the "voter" is determined by the computer in order to take into account the "human factor". Once the politicians figure out which city the voter lives in (which occurs only days before the actual vote, I believe) they descend on it in full force, still not knowing who the actual "voter" is.

The idea is the computer can extrapolate with all of the information who the people would have chosen if everyone had voted.