“…Dahl's pioneering study on opposition in ten western democracies (1966) dates back half a century, and it is striking that the research field on opposition since then has seen few scholarly contributions based on solid empirical data (for notable exceptions, see, Andeweg, 2013;Blondel, 1997;Christiansen and Damgaard, 2008;Helms, 2004Helms, , 2009Kaiser, 2008;Loxbo and Sjölin, 2017;von Beyme, 1987). Even more striking is the absence of studies that focus on opposition in EU politics; contributions by Neunreither (1998), Mair (2007Mair ( , 2013 and Helms (2009) are rare exceptions.…”