What political principles should Kantians adopt in the twenty-first century? For Kant scholars such as Allen W. Wood - co-general editor of the Cambridge Edition of the Works of Immanuel Kant and prominent advocate of Kant's ethical thought - the answer is clear: Kant's principles, rightly understood. For other Kantians, however, philosophers should heed Kant's advice in his essay on Enlightenment and courageously invent new principles. This essay draws upon the writings of John Rawls and Gilles Deleuze - preeminent Kant scholars and political theorists in Anglo-American and Continental philosophy, respectively - to support the latter thesis. Initially, I examine Wood's exposition and defense of Kant's principles in his essay, "The Supreme Principle of Morality." Then, I consider Rawls's analysis and reworking of Kantian constructivism in his essays and lectures on Kant as well as in Political Liberalism. Next, I examine Deleuze's interpretation and use of Kantian constructivism in What is Philosophy? and A Thousand Plateaus. Finally, I advance two claims why Kantians should invent new principles rather than retain Kant's. Philosophically, Kantians may advance stronger theories by incorporating the criticisms of Kant's principles made by such philosophers as Hegel, Dewey, Nietzsche, and Bergson; and politically, Kantians may articulate more timely theories by adapting Kant's principles to the conditions of late-modernity. The debate over Kantian principles affects whether philosophers view Kant scholarship as practical philosophy itself or as a preparatory exercise for the task of generating new principles. The debate also impacts whether Kant's heirs on the Left retain the ideals of the Enlightenment or confidently invent new ones. ..PAT.-Unpublished Manuscript [ABSTRACT FROM AUTHOR]