http://www.cnn.com/2008/POLITICS/10/28/polling.lookback/index.html(CNN) -- With a week to go before Election Day, most recent national polls show Democratic presidential nominee Barack Obama with an advantage. But how much are they to be believed?
The most recent national CNN poll of polls showed Obama with an 8-point lead over Republican presidential nominee John McCain, 51 percent to 43 percent. The polls were conducted October 21 through October 26.
Most other national polls show Obama with a lead ranging between 5 points and double digits.A look at CNN polling during the same period before Election Day in 2000 and 2004 suggests that political observers and campaign supporters ought to be cautious in declaring the race over because of current polling numbers.
When a presidential race has a non-incumbent in the lead, like this year, the poll numbers tend to tighten as Election Day gets closer, CNN senior researcher Alan Silverleib said "Any time it looks like they are on the verge of voting somebody new into office, there is buyer's remorse," he said. "Based on that, and the fact that the country has been so polarized in recent elections, there's pretty good reason to think that the polls might tighten up a little bit."
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There have been a few examples of such "buyer's remorse" in recent history, Silverleib said.
"We saw that with Clinton in 1992, when the polls suddenly tightened up during the last week," he said. "It was almost like people saying, 'Do we really want this guy?' "
They did. Clinton soundly defeated President George H. W. Bush, 43 percent to 37 percent.