The Left has always been fratricidal. It came as no surprise, while talking to a staff member of the Pacifica Radio Network (the most Lefty radio network outside of Cuba) when I was told about the endless fights over Political Correctness at the Network and at the stations.
What did surprise me was the imaginative term he used to describe his unyielding, uncompromising opponents: the suicidal left.
The ineffectiveness of Palestinian suicide bombers seems to be sinking into the consciousness of the Left.