>> Dems always poll better at weekends also in Rasmussen <<
Correct — strictly speaking — but it’s basically irrelevant to the discussion at hand, because Rasmussen always adjusts his results to eliminate the “weekend effect.”
(He also adjusts his numbers, by the way, to eliminate factors like the bias arising from the problem that eldery people are much more likely than young people to answer a landline phone.)
The adjustments aren’t necessarily correct.