The quest for a common collective identity has become a challenge for modern democracy: Liberal demands for greater inclusion and individual freedom, aspirations for a strong and solidaric political community, as well as nationalist or right-wing populist calls for exclusion and a preservation of hegemonic national identities are creating tensions that cannot be overlooked. This article therefore formulates the central question of how collective identity can be possible in a liberal democracy. Based on a case study on Germany, it will therefore be examined whether Leitkultur as a model of political integration can serve in generating a functional democratic collective identity. The necessary benchmarks guiding the analysis will be defined beforehand from a systems-theoretical perspective, balancing inclusion and exclusion within three crucial dimensions: normative basics, historic continuity, and affirmative bindings. The results show that a static definition of a German Leitkultur would in the long run neither achieve functional inclusion nor be able to generate the necessary cohesion of a political community, especially regarding the second and third identity dimensions.