This article analyzes two different republican orientations underlying The Federalist Papers. The first is constitutional republicanism, which develops representative government and separation of powers to realize modern constitutionalism. The other is democratic constitutionalism, which resorts to the people themselves during grave constitutional moments. This article further analyzes two possibilities to synthesize constitutional and democratic republicanisms on the level of constitutionmaking. Bruce Ackerman deploys deliberative democracy to reduce the uncertainties of populist democracy. Hannah Arendt, by contrast, provides the insight of ”continuous founding” which has resonance in the idea of ”authorized innovation” in The Federalist Papers.