On May 23-26 citizens in all (still) 28 EU countries will go to the polls and select the 751 members of the European Parliament. Rachel Tausendfreund talks to Rosa Balfour, a senior fellow with GMF‘s Europe program based in Brussels, about the populist challenge and the different shades of nationalism and populism across Europe, and how the election's outcome will shape the EU and national politics for the next five years.