Where he tries to lay out a policy agenda, as in his recent book The Future of American Progressivism (co-written with Roberto Mangabeira Unger), I think he oscillates between dreary, conventional ideas (public financing of campaigns, class-based rather race-based affirmative action, a consumption tax) and utterly impractical ones (a modified parliamentary system, explicit economic redistribution, mandatory voting).
He tends to go from dreary ideas to impractical ones.