FWIW
http://pewresearch.org/pubs/964/ConclusionEven though the omission of cell phones from election polls does not currently make a large difference in the substantive results, Pew's surveys this year suggest at least the possibility of a small bias in landline surveys. Such a bias could be consequential in an election that appears to be very competitive right now, especially if significant numbers of young people turn out to vote. In particular, the research suggests that estimates of the candidate preferences of young voters may be biased if cell phone interviewing is not included in the survey.
These problems are all the more pressing as the number of Americans who are reachable only by cell phones increases. U.S. government surveys estimated that about 15% of adults were "cell only" in the fall of 2007 and the rate of increase since 2004 has been at least 2% a year, meaning that the number may be as high as 17% in this election cycle.
Many polling organizations are including cell phones in their samples this fall, and the Pew Research Center for the People & the Press will include cell phone samples in all of its remaining election polls.<.div>
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