The most difficult job a pollster has is trying to figure out who the actual voters are going to be in a given election year. This is easier said than done, because we know that (a) almost all survey participants say they will vote in the midterm election and (b) historically, only about 40 percent will.Pollsters do their best to solve this problem by screening out those who are unlikely to vote using a question or series of questions probing interest in the election and/or prior voting behavior. These techniques vary widely from pollster to pollster. Some pollsters use especially...
Source: http://www.realclearpolitics.com/articles/2010/10/22/whos_going_to_vote_this_year_107686.html
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