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by disgruntledphd2 2063 days ago
Sure, these are all concerns. However, as long as they are not systematic errors for or against one candidate, they end up not mattering very much.

Andrew Gelman (the author of this post) has also done a bunch of work on how different parties supporters become more/less likely to respond to polls based on what the current results are, which has been incorporated into the newer forecasts.