Gallup had also previously reported no real difference in preferences of cell phone only users.
Cell phone only people tend to be younger. Younger people tend to support 0bama. This is all reflected in the demographics portion of the poll. If 18-34ers who use cell phones only supported 0bama at a greater clip than their landline counterparts, you’d be on to something. but they don’t (if you believe Gallup, which you seem to).
I don’t know whom to believe this election. Perhaps Mason-Dixon is correct and Obama has only only low-single digit lead (which makes the main battlegrounds competitive).
Or perpaps Gallup is correct, and cell phone effects are real and significant.
We will see the results in 48 hours, and some pollsters will have their reputation tainted, if not ruined.