SurveyUSA reviewed data collected from the 2010 elections to evaluate how much polling or not polling cell phone users skews poll results. I can’t say that I’m surprised by their findings.
The data that included cell phones was +9 in favor of Democrats.
In the 2010 election, SurveyUSA contrasted the vote of home-phone and cell-phone respondents in 7 different candidate elections. On average, cell-phone respondents voted 9 points more Democratic than did home-phone respondents. Had SurveyUSA not made special effort to reach the cell-phone respondents, its poll results would have been more Republican.
This is why it’s important to know who they call and how polling firms do their work. A 9 point skew is massive.
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