It would seem to me the question is not if cell phone users vote differently, but rather do they differ from non-cell phone users of
similar demographic charateristics.
There is no doubt that the 21 year old cell phone only demographic is substantially different than the 47 year old land land owning demographic, but that is not the question..
Pollsters already ensure that young people are appropriately represented in the sample, and that their income, education, etc matches the totality of their demorgraphic -the isolated variable here is just the cell phones, not age, income, education, etc...
IE is the totality of 23 year old males with just a cell phone intending to vote differently that the totality of 23 year old males who may also have a landline?
Gallup BTW is trying to isolate this by doing calls to cell phone exchanges and then askng as one of the screening questions if the cell phone user is cell phone
only.. this way they can build up a database on cell phone only users versus cell phone + land line users.
The next issue is VOIP users... but that is another ball of wax
