A review of Eric Lott, The Disappearing Liberal Intellectual. The review is interesting, if a bit abrupt in ending. Lott's book sounds pretty limited. You are probably better off reading Kevin Mattson, When America Was Great: The Fighting Faith of Postwar Liberalism.
Speaking of Mattson, a guy who gets more work done before breakfast than I do in a year, he has yet another book out, this one a biography of Upton Sinclair.