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I’ve been waiting to post something on the “cellphone problem” — the fact that almost all pollsters don’t include cellphone numbers in their sample, and that cellphone-only voters tend to be different from landline voters. But Mark Blumenthal has covered pretty much everything that I might want to say, and so I’ll direct you over there for the detail. It’s a real issue, and one reason that, even on the morning of the election, there is going to be a larger margin of error than the pollsters advertise.

Nate Silver is the founder and editor in chief of FiveThirtyEight.

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