Chris Cutrone, Spencer Leonard and some others based mostly in colleges in Chicago.
Their central thesis is not just that the left has lost its way, but that that has an impact on a wider political malaise.
Their critique of the left turns mostly on the projection of revolutionary potential onto what are essentially reactionary movements (like in Iraq or Afghanistan) but those are taken as symptomatic of a broader retreat from socialism. Cutrone in particular alludes to a new era in politics, where previous positions no longer hold, though I have to say, I don't always follow the argument.
You can, though, at http://platypus1917.org/