This essay takes the 30th anniversary of Ingeborg Maus’ best-known book, ‘Zur Aufklärung der Demokratietheorie’ (‘On the Enlightenment of Democratic Theory’), as an occasion to examine the program of her critical theory in an independent research study. In the first chapter, the characteristic features of this program are presented, with Horkheimer’s and Adorno’s ‘Dialectic of Enlightenment’ as the point of reference. The second chapter then shows that Maus’ program of an enlightenment of democratic theory is characterized by a specific Rousseauism, which is to be seen as the ‘undialectical’ basic structure of her critical theory. The last two chapters are devoted to the concrete object on which Maus carries out her program: Immanuel Kant’s philosophy of state and the current reception of this philosophy. While the third chapter, looking at Kant’s late ‘Staatsrecht’ in the ‘Metaphysics of Morals’, demonstrates the power of Maus’s program in the field of Kant scholarship, the last chapter argues that her approach reaches its limits on this very object, Kant’s late ‘Staatsrecht’ of 1797. Because of her in crucial respects ‘undialectical’ epistemological interest, Maus is unable to recognize Kant’s thoroughly dialectically organized philosophy of state in the 1797-text. This negative insight opens up the possibility of modifying Maus’s program of a critical theory.