From a new Pew report:

In each of the surveys, there were only small, and not statistically significant, differences between presidential horserace estimates based on the combined interviews and estimates based on the landline surveys only. Yet a virtually identical pattern is seen across all three surveys: In each case, including cell phone interviews resulted in slightly more support for Obama and slightly less for McCain, a consistent difference of two-to-three points in the margin.

Here’s the data:

Just to recap, what was Nate’s conclusion?  2-3 points.

[Via Ambinder]

Tags: politics, polls

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