Good link, that sums it up pretty well. The opinions of 1000 Americans who own telephones can't be easily extrapolted to the population as a whole more than a random sample of 0.0001% of a sample of people who regularly participate on The Cellar.
Quote:
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In addition to sampling error, the practical difficulties of conducting any survey of public opinion may introduce other sources of error into the poll. Variation in the wording and order of questions, for example, may lead to somewhat different results.
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http://www.nytimes.com/2009/02/24/us...1&ref=politics