Interesting. I’m not a regular at TPM, but I get a lot of their stories second-hand. For that reason, I’ve never really seen their comment threads.
Having read this one, I saw nothing I would consider “ultra-left,” unless you think that means left of Obama. I’m one of many, many liberals who are happy to criticize him from the left - maybe he’s doing the best he can, but in another era Obama would have been called a moderate Republican.
Are people who think the ACA didn’t go nearly far enough “ultra-left?” How about people who think Snowden is a patriot? Or people who think blowing up American citizens without due process is wrong? Hey, I’m old enough to remember when “ultra-left” started with, “Eat the rich! Property is theft!”