Like all organizations that conduct public opinion polls, Rasmussen Reports weights its data to reflect the population at large (see methodology). It is important to remember that the Rasmussen Reports job approval ratings are based upon a sample of likely voters. Some other firms base their approval ratings on samples of all adults. Obama's numbers are almost always several points higher in a poll of adults rather than likely voters. That's because some of the president's most enthusiastic supporters, such as young adults, are less likely to turn out to vote.
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Rassmussen is considered pro Republican and will be ignored.
I think they had McCain Obama too close to call. Shame on you Matt. Save the sirens for Gallup etc.