Commentary Magazine:

…the fact that 14 percent of Americans now only use cellphones. Pollsters haven’t figured out how to factor in cellphones, so that’s 14 percent of the potential electorate missing from their sample to begin with. Add further the fact that many people — no one has a number, but it is significant — now hang up on people they don’t know or don’t answer the phone when their Caller ID offers an unknown phone number, and you have another segment of the population that is offline.

Now consider Iowa and New Hampshire. These are states whose residents are being bombarded daily by phone calls from campaign volunteers, campaign staffers, and recorded messages from candidates.

(via Instapundit)