Dissent Magazine has an article by Andrei S. Markovits ( Dissent Magazine ) about the history of the left from 1945 to now. It looks at the gains and the defeats that the left has encountered and the change in both structure and ideology that has occured in that time.
His basic thesis is that the left, while formerly, motivated by a concern for workers has fragmented itself into mostly issue based activism without a coherent center.
His article is mostly on European leftism but I think that it can be applied to us here.
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