Rasmussen asks 5% more dems in all his polling.He states this on his web site.Its some sort of complicated system that is supposed to correct mistakes from 2000????
And this is really stupid reasoning on his part. For all he knows the Christian Right sat home in 2000 and won't this time.
Polling should be a random sample of the population as a whole. The random part loses integrity when you start "weighting" the survey sample. Basically Rasmussen thinks 5% more dems will show up at the polls. That's a pretty wild assumption. This becomes a "prediction" on his part and not a representative sample of the voters.