Democrats believe that Rasmussen, who is acknowledged as one of the more accurate political pollsters, is either inaccurate or the purposely biased. They whine that Rasmussen's polls constantly report numbers that are about 5% lower than other polls,which is generally true because Rasmussen measures likely voters, other pollsters measure all adults.
Democrats are turning their fire on Scott Rasmussen, the prolific independent pollster whose surveys on elections, President Obama’s popularity and a host of other issues are surfacing in the media with increasing frequency.
http://yidwithlid.blogspot.com/2010/01/political-hubris-democrats-blame.html