The comparative study of populism has produced a wide spectrum of scholarship that covers different regions and historical periods. However, and despite significant breakthroughs in conceptualization and methodology, the process of scientific cumulation is hampered by the unyielding persistence of several misconceptions around the nature of populism, even in the face of repeated refutation by empirical developments. In this paper, I single out and discuss three main problems in the literature: the regional bias, the policy bias, and the normative bias. I argue that to protect the study of populism from the increasing threat of conceptual dilution due to sensationalist punditry and partisan scholarship, analysts should (a) avoid generalizing from region-specific perspectives; (b) remain skeptical of any association of populism with economic policy; and (c) refrain from exaggerating populism's impact on democratic institutions.