Élodie Druez is F.R.S.-FNRS Research Fellow at the GERME, Free University of Brussels, Belgium.Frédéric Gonthier is Full Professor of Political Science at Sciences Po Grenoble, University of Grenoble-Alpes, Pacte CNRS, France.Camille Kelbel is Scientific Advisor at the Fund for Scientific Research (F.R.S.-FNRS), Belgium.Nonna Mayer is CNRS Research Director Emerita at the Centre for European Studies and Comparative Politics of Sciences Po (CEE), France.Felix-Christopher von Nostitz is Associate Professor in Political Science, ESPOL-LAB, Catholic University of Lille, France.Vincent Tiberj is Full Professor of Political Science at Sciences Po Bordeaux, Centre Emile Durkheim (CED), France.