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Structural theories of international peace among democratic regimes have relied on two distinct explanatory logics: democratic institutions may cause a state’s foreign policy to tend toward peace by exposing policymaking elites to pressure from ordinary citizens (the popular logic) or to pressure from other governmental agencies (the elite logic). These logics are often conflated in scholarly studies of war and peace, but we attempt to isolate the popular logic for empirical testing by developing a novel measure of institutionalized popular influence, the Institutional Democracy Index (IDI). Whereas previous usage of the Polity index to operationalize democratic structures has succeeded in testing the elite logic more than the popular logic, we use the IDI to analyze long-established democracies’ involvement in international conflict between 1961 and 2001. What we find are significant differences within the family of …