http://www.nytimes.com/2004/09/18/politics/campaign/18explain.htmlVarying Polls Reflect Volatility, Experts Say
By CARL HULSE
Published: September 18, 2004
WASHINGTON, Sept. 17 - With national public opinion surveys showing the presidential race to be anywhere from a dead heat between President Bush and Senator John Kerry to Mr. Bush's holding a commanding lead, potential voters have their choice of what to believe.
But survey experts say such disparities in the polls are not unusual at this stage of a campaign and reflect both a volatile electorate and methodological differences between the polling organizations.
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David W. Moore, senior editor of the Gallup Poll, said he believed that even slight differences in the time periods when the surveys were conducted could shift the results, given the intense news media coverage of the issue of Mr. Bush's time in the National Guard and whether disputed memos regarding his service there were forged.
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"My sense is that Bush is ahead by several percentage points, that the public is pretty volatile, that the National Guard issue could play either way for one of the candidates,'' Mr. Moore said. "It is clearly not decided what the outcome will be.''
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