UCBearcats1125 Wrote:Yup that's why bush has a 8 point lead
This is from an article from USA Today about Gallup sampling practices.
At issue: Whether too many Republicans end up being counted as "likely voters" in Gallup's polls. In the past six USA TODAY/CNN/Gallup polls this year, about 40% of the likely voters in the surveys said they considered themselves to be Republicans. By one measure, that's higher than might be expected: Exit polls after the past three presidential elections showed that about 35% of voters in those years said they were Republicans.
Peter Schurman, MoveOn.org's director, said Tuesday that Gallup "should admit its mistake and correct it by using samples that more closely reflect" likely turnout.
Frank Newport, editor in chief of the Gallup Poll, said the critics don't understand the science behind the polls. "This issue has been the subject of intense scholarly discussion and years of research. We're confident in what we're doing," he said.
Actually, it's what Gallup doesn't do that is at the heart of the debate. The polling firm does not adjust its "pool" of voters to add or subtract Republicans or Democrats in an effort to mirror those parties' estimated make-ups.
Among the reasons Gallup doesn't try to do that:
• It believes there are no reliable data on which to estimate exactly how many Republicans or Democrats there are in the country. Some states, for example, don't require voters to register by party affiliation. Basing an adjustment on previous year's exit polls, "means you're 'weighting' one poll based on the results of another poll, which has its own built-in sampling error," Newport said.
• It believes party affiliation "is an attitude, not a demographic trait" and that voters can change their minds about which party they identify with more than once during an election year, Newport said. That would explain, he said, why the number of people who identified themselves as Republicans went down during this year's Democratic primaries — when Kerry and his competitors were in the news.
Most polling firms use the same methods as Gallup when identifying party affiliations. Among those are the surveys done by the Pew Research Center for the People and the Press. Andrew Kohut, the center's director, said in a statement last week that "important shifts in voter sentiment" could be missed if pollsters tried to apply rigid party formulas to results.
But not all pollsters agree with Gallup's approach. John Zogby is CEO of the independent polling firm Zogby International.
He adjusts the voter pools in his surveys to mirror party affiliations expressed in earlier exit polls. "I am one of the heretics in the polling industry," he said Tuesday. He maintains that "there are variations in people's party affiliations, but they aren't changing much daily, weekly or even monthly."
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