Mini-Publics, (Lack of) Representativeness, and Legitimacy Beliefs

The participants in deliberative mini-publics are typically randomly selected, and mini-publics are therefore often marketed as representative of the wider population. However, in practice mini-publics are unlikely to be fully representative due to their small size and non-response bias. I report the results of a pre-registered survey experiment designed to assess the implications of deviations from statistical representativeness for citizens’ legitimacy perceptions (N = 1,308). Consistent with prior research, I find that the involvement of a mini-public in democratic decision-making can lead to substantial increases in perceptions of process legitimacy; however, even minor biases in the composition of mini-publics substantially decrease those gains while larger biases can wipe them out entirely. The results of this study temper hopes that mini-publics offer an easy fix to perceptions of low democratic legitimacy.