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I've been polled in the past. Had just once call this year, but declined, as I didn't recognize the organization conducting the poll.
I've been called with 8 or so pre-recorded political messages, from both major parties.
The organizations conducting the polls can definitely introduce bias, though for the major ones, I think it's usually uninintentional. (Except openly partisan groups like DCorps). Pollingreport.com has a good summary of national polls, along with exact wording of questions. Bias goes beyond wording, however; people may respond differently, including just hanging up, depending on whether they're polled by someone with a southern accent or a bronx accent. The LA Times has been criticized as skewing democratic because of the people conducting the polls.
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