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Introduction Setting the scene: National parties and democracy in the European UnionNational political parties are crucial actors in democratic systems. By participating in elections, they are the most important organisations that link citizens to the institutions of the state. Parties need to respond to the preferences and demands of citizens. And, if they win elections, they need to channel such preferences and demands into proposals for government policies (Sartori, [1976, p. 25). Fundamentally, then, in democratic systems, parties perform the function of "allowing the governed to express their demands freely and in such a way as to render them effective within the very machinery of government" (Sartori, 2005, p. 30). The performance of this function can, at heart, not be replaced by another institution, organisation, or group of actors (p. 28).In a well-functioning representative democracy, also the policies of the European Union (EU) would ultimately be the result of the expression of citizens' preferences (Hix, Kreppel & Noury, 2003, p. 310). The EU institutions take highly important policy decisions in many areas. From the area of foreign and security policy, in which they have limited, but special competences; to areas such as the internal market and regional policy, in which they share competences with the member states; and areas like trade, competition, and customs, in which they have exclusive competences. At the same time, member states retain competences to make legislation in other areas, including health and education. The EU is thus fundamentally a 'multi-level system': decisions are made both at the national, member state level and the supranational, EU level. These levels are inextricably linked to each other (Scharpf, 1994;.The democratic system of the EU is, however, particular. Most importantly, the "electoral connection" between citizens and parties at the European level is weak (Lindberg, Rasmussen & Warntjen, 2008, p. 1108. Granted, the European Parliament (EP) has become an important, directly elected instit...