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In addition to the points I have raised previously about Rasmussen, i.e.,:
* empirical house effect about 2 points to Republicans;
* calling only landlines which systematically under samples a demographic that leans Democrat; and
* using only robocalling, which has a low response rate and preferentially samples the enthusiatic.

It turns out there is another interesting aspect of Rasmussen in the wake of the recent flap about oversampling and that is that Rasmussen weights according to party affiliation and is highly unusual in doing so. Changing party identification is one of the data points one would hope to find from polling, so weighting by it is likely to distort all of the data.
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