Although the study of populism has traditionally been the domain of Latin Americanists, research here has become increasingly comparative. One of the most important payoffs of this comparative work is conceptual. Rather than defining populism in structuralist, economic, or political-strategic terms, a growing number of scholars around the world are using an ideational conceptualization that draws heavily from earlier discursive theories. By employing the ideational approach, scholars have been able to provide empirical measures of populist discourse. In this article we explain and show the advantages of this ideational approach to a Latin American audience by presenting a new historical dataset measuring the discourse of Argentine, Chilean, and Peruvian presidents across the twentieth century. Our main intent is to clarify the ideational approach as well as to enliven the conceptual debate. While we are critical of alternative definitions, we acknowledge and reassess their theoretical insights.
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