Let me re-introduce a point from the Rorty/Alterman debate that was passed over: some leftists, I would argue, conflate the concept of "identity"--in particular, those who would mix up "identity politics" with "identity theory." The former, identity politics, I don't see as a problem. The latter, on the other hand, I do. What's particularly a problem, however, is the claim that "identity politics" implicitly depends upon "identity theory"--particularly an essentialist account of what constitutes this "identity." I Probably this derives from the claim that politics presupposes a theory of the self--c.f., Michael Sandel's (wrong-headed) critique of Rawls.
John St. Clair