Reread the post, it should be quite clear. Rasmussen divulged that Bush was beating Kerry by getting more of his base, and beating Kerry by getting more D's, then they are both tied in getting I's. The only way then that the poll can be tied is that Rasmussen is underweighting R's, and by the numbers, it looks like a significant underweight. He was doing the same thing in the IA poll and come to find out in today's polls, he didn't post the internals. Wonder why.
Thanks for the explanation. It wasn't clear to me, which is why I asked for clarification.
Rasmussen's assumptions include a loose LV screen and that Nader won't be a factor, both favorable for Kerry. His national tracking poll appears to be about 2 points favorable to Kerry and the state polls about 4 points.