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The Left prominently trumpets the so-called "netroots," i.e., all the Left-wing blogs and their supporters for evidence that America wants to do this or that ( support Howard Dean, end the war, fill in the blank).
It is precisely because the Left pushes the nettroots as supposedly representative of Left-wing sentiments that comments on Left-wing blogs are fair game for comment. There's no "cherry picking" about it.