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. 
His ideas are going to make the country go down in flames.