Their numbers are generally slightly lower than other polls - that's not because of some secret plot to screw Obama, it's because they use likely voters, instead of all adults.
I don't give a **** what all adults thing, because all adults don't vote. Accordingly, I pay attention to Rasmussen. When you make ridiculous claims about how he's biased to the right, you just demonstrate your own bias.
[ame=http://en.wikipedia.org/wiki/Scott_Rasmussen]Scott Rasmussen - Wikipedia, the free encyclopedia[/ame]Tony Snow, White House Press Secretary for President George W. Bush, attacked Rasmussen’s polling on the War in Iraq. More recently, Democrats have attacked his polling on President Obama’s Job Approval Rating and other topics.
Rasmussen’s reported Job Approval Ratings for President Obama are typically several points lower than Gallup’s. He says this is because Gallup polls all adults and he polls likely voters.
Both Republican and Democratic candidates for office cite Rasmussen data in their correspondence. Susan Estrich, who managed the Presidential campaign for Michael Dukakis said, “If you really want to know what people in America think, you can't find a smarter guy to ask than Scott Rasmussen."
Rasmussen's polls are notable for their use of automated public opinion polling, involving pre-recorded telephone inquiries. These types of polls have been shown to produce accurate results at low cost. But some have doubted their reliability. In 2004 Slate magazine said they “publicly doubted and privately derided Rasmussen” polls because of the methodology. However, after the election, they concluded that Rasmussen’s polls were the most accurate.
At the end of the 2008 Presidential Election, there were eight national tracking polls and many other polls conducted on a regular basis. Liberal polling guru Nate Silver reviewed the tracking polls and said that while none were perfect, "Rasmussen -- with its large sample size and high pollster rating -- would probably be the one I'd want with me on a desert island." After the election, Rasmussen's poll was rated as the most accurate, when compared to various other final pre-election polls.