blog.msurveys.com

Not yet, anyway.

The report, based on polling by the Pew Research Center and The Associated Press, reaffirmed that those with only a cellphone tend to be younger, less affluent, more likely to be male and more likely to be minorities.

But when the responses to a series of political questions from those with only cellphones were blended in with the rest of those reached on traditional landlines, results were not affected. Very small differences in the results virtually disappear when the cellphone sample is blended together, and weighted to match the demographics of the national population.

The growth of the cellphone-only group has raised concerns among survey researchers that it would render obsolete the most commonly used polling method of contacting a random sample of the public on traditional landline phones.

Growth of the cellphone-only group may eventually reduce their differences from the overall population, said Scott Keeter, a survey researcher at the Pew Research Center."