Eric Sangar is Assistant Professor in Political Science at Sciences Po Lille, University of Lille, France, as well as Fellow at the Marc Bloch Centre, Berlin, Germany. Valérie Rosoux is Research Director at the FNRS and Professor in Political Science at UCLouvain, Belgium, as well as Fellow at the Max Planck Institutes Luxembourg and Halle, Luxembourg and Germany. Anne Bazin is Assistant Professor in Political Science at Sciences Po Lille, University of Lille, France. Emmanuelle Hébert External Scientific Fellow at the Institut de Sciences Politiques Louvain Europe (ISPOLE) at UCLouvain, Belgium.