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What the author seems to miss is that left and right in the blogosphere are NOT the same. Take Salon, ThinkProgress or the Huffingtonpost - ANY rightwing "troll" is welcome to go on there and participate in the discussion, which they do lustily. But we on the left are NOT welcome to participate in the discussion on a comparable rightwing site such as Redstate. The second their narrow views are challenged, my account is banned, and if I keep trying, my IP address is banned.
Al Gore recently said it best, that the "on one hand, on the other hand" approach to treating differing opinions as simply 2 sides of the same coin is not constructive. Please, Mt. Sunstein, stop insulting us by saying we are just like the Republicans, we just have different opinions. We are not. We have had total control of the government many times before and nothing like what is happening now has ever happened. Our political leanings are as much about our interaction with other citizens than anything else. And that is not nearly the same.