Supplementary materials to "Uncertain jobs, certain votes? Relations between job insecurity, union attitudes, and political behavior" [Other]

Supplementary materials [Other]. The related article is Vesper, D., & Zacher, H. (2026). Uncertain jobs, certain votes? Relations between job insecurity, union attitudes, and political behavior. Journal of Social and Political Psychology, 14(2). https://doi.org/10.5964/jspp.17915