Left-Wing Blog Comment Threads

I'm more of a comments dweller than a blogger, and I usually keep to the dextro-sphere. But I've always recognized the need to avoid the echo-chamber effect. So I sometimes sally forth into a lefty blog, and weigh in on the comments thread. I do try not to troll, though that's in the eye of the beholder. Here I am getting tossed over the ropes at Sadly No!, for example.