Supplemental Material2 - Supplemental material for Political institutions and collective attachments AksoyDeniz HadzicDino 2019 <p>Supplemental material, Supplemental Material2 for Political institutions and collective attachments by Deniz Aksoy Department of Political Science, Washington University in St. Louis, St. Louis, MO, USA Dino Hadzic Department of Political Science, Washington University in St. Louis, St. Louis, MO, USA in European Union Politics</p>