How should democratic communities decide who should belong? Recent debates about issues such as voting rights for prisoners, denationalization policies or citizenship tests raise this fundamental democratic question. While many scholars argue that decisions about citizenship and voting rights should be more inclusive of subjected outsiders and more independent from electoral partisan politics, we still lack institutional proposals for inclusive and independent membership politics. This article contributes to the nascent institutional turn in the debate about democratic membership boundaries. My aim is to show that normative debates about membership politics can benefit from recent advances in democratic theory on sortition-based democratic innovations, constructive representation and systems thinking.
I argue that membership politics could be democratized by introducing a randomly selected political institution, which I call ‘boundary assembly’, that equally represents members and nonmembers and is charged with making binding decisions on a subset of a state’s membership questions. I argue that the strongest objections to empowered randomly selected assemblies (shortcut objection, alienation objection, capture objection, technocracy objection) lose most of their force in the ‘extraordinary’ political context of decisions on membership boundaries. Boundary assemblies cannot ‘solve’ the democratic boundary problem, but they could be a first step toward more democratic membership politics.