Given the findings about possible non-random discrepancies in Research 2000 polls that were published yesterday on Daily Kos and similar results from Nate Silver, I've added the following disclosure to previous posts that cite Research 2000 polls:
[Update (6/30/10): Serious questions have been raised about the validity of Research 2000's polls. The results discussed below should thus be viewed as potentially suspect until the matter is resolved.]
More work is needed to fully analyze these results (the planned lawsuit by Daily Kos may also reveal relevant evidence), but the disclosure seems necessary given the cloud of suspicion around Research 2000 at this point.
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