Designed to enlighten, polls often add confusion to races
Absentee voters and people with only cell phones left out of surveys
By Josh Richman, STAFF WRITER
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Anecdotal data suggests there could be a rapidly growing number of young, technologically savvy and perhaps liberal-leaning, voters with only cell phones who are utterly invisible to pollsters, Trounstine said. Usually, when an age group or some other demographic is underrepresented in a polling sample, pollsters can weight the few respondents they've got to make up for the disparity. If there are no such respondents in the sample at all -- like the people with only cell phones -- there's no way to compensate.
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In California, registered voters declare a specific party affiliation or decline to state any, making it easy for pollsters trying to build a representative sample, he said. "But you can't do that in states like New Hampshire, where you don't register by party -- and that's a swing state. So how do you model the electorate?"
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MoveOn.org, Michael Moore and other liberal entities have attacked the Gallup polling organization recently for methods it uses to identify "likely voters" and for oversampling Republicans, resulting in a bias against Kerry.
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