Presidential Polling: Celled Out?

From the NS file, a surveyclaims to have discovered that cell phones are "left out" of presidential polling. While this finding is not revelatory, it does shine light on the increasing challenges that face folks collecting survey data by phone:
Merely 3 percent of Americans use a cell phone as their only phone today. But Yankee Group senior analyst Kate Griffin predicts that by 2009 as many as 15 percent of American adults will have cut the cord. If that happens, pollsters would face the frightening proposition that more than one in seven adults would have zero probability of being included in a sample. If that scenario plays out, it could put a serious dent in the fundamental statistical basis of national polls.

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