To: American Spirit who wrote (3645 ) 10/26/2000 11:59:49 AM From: Slugger Respond to of 10042 Gallup's Credibility Gap What's with those wild swings in the polls? Thursday, October 26, 2000 12:01 a.m. EDT "The Gallup Poll just has no credibility with me anymore," the network producer sighs. "Even if the survey methods are valid, how can you tell viewers that a swing of 15 points in four days is realistic?" They might be even more skeptical of Gallup's tracking poll if they knew that the swings are due in large part to the company's nightly sample having large fluctuations in how many Democrats vs. Republicans are interviewed. One three-night sample, on Oct. 4, had 37% Democrats and 30% Republicans. Perhaps not surprisingly, Al Gore had an 11-point lead. Three nights later, on Oct. 7, a completely new sample consisted of 39% Republicans and only 31% Democrats. Lo and behold, George W. Bush suddenly had an eight-point lead. Typical exit polls of actual voters, taken as they leave the polls, show the parties evenly matched or with just a point or two advantage for Democrats. Gallup and CNN, a major sponsor of its poll, insist they have a plausible explanation for this. Gallup told the Washington Post that in 1996 fully 25% of the people they contacted changed their party identification at least twice. That seems highly implausible, and James Campbell, a polling expert at the State University of New York at Buffalo, says it's "crazy" and misleading to base nightly poll results on a hypothetical electorate that switches party identification so readily. Gallup has certainly been a roller coaster this year, while other tracking polls have been remarkably placid. But because of Gallup's reputation, and because its tracking poll is sponsored by CNN and USA Today, the company's stomach-churning numbers get a lot of attention and overshadow the four other tracking polls. more--> opinionjournal.com