I begin the Conclusion by considering the widely felt crisis of parliamentarism that unfolded at the turn of the twentieth century as the rise of electoral democracy led to the rise of a plebiscitary executive, upending previous presumptions about the centrality of parliament to political life. But despite these transformations, the classical liberal theory of parliamentarism persisted, most notably in the writings of Max Weber, who defended a constitutional ideal that was strikingly similar to that of Benjamin Constant. In the decades since Weber, political institutions have evolved even further away from the liberal parliamentary model. Yet the values and concepts of liberal parliamentarism continued to persist in twentieth-century democratic theory. Recent political crises reveal that the liberal constitutional structures put in place during the second half of the twentieth century have by no means overcome the enduring problems of modern representative government, which an earlier tradition of liberal theorists sought to answer through parliamentarism.