I was reading the news and came across this article, Polls: Cell phone users prefer Obama, landline users like Romney. Reading the typically rabid comments to the yahoo article, I could see that what is known to stats people is not known to the general public: Different demographics exist between cellular and landline phone users. It shouldn't be a surprise that the type of phone surveyed should impact the results of the poll.
For more information, check out this publication, Assessing the Cell Phone Challenge on the Pew Research website. Pew Research is one of the largest organizations who regularly samples Americans on a wide range of topics, so the differences between landline and cellular users is very relevant to their ability to do proper surveys.
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