Giandomenico Majone and Andrew Moravcsik have argued that the EU does not suffer a 'democratic deficit'. We disagree about one key element: whether a democratic polity requires contestation for political leadership and over policy. This aspect is an essential element of even the 'thinnest' theories of democracy, yet is conspicuously absent in the EU.

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The European Union series is designed to provide an authoritative library on the European Union, ranging from general introductory texts to definitive assessments of key institutions and actors, policies and policy processes, and the role of member states.

With the European Parliament comprising politicians from many different countries, cultures, languages, national parties and institutional backgrounds, one might expect politics in the Parliament to be highly-fragmented and unpredictable. By studying more than 12,000 recorded votes between 1979 and 2004 this 2007 book establishes that the opposite is in fact true: transnational parties in the European Parliament are highly cohesive and the classic 'left-right' dimension dominates voting behaviour. Furthermore, the cohesion of parties in the European Parliament has increased as the powers of the Parliament have increased. The authors suggest that the main reason for these developments is that like-minded MEPs have incentives to form stable transnational party organizations and to use these organizations to compete over European Union policies. They suggest that this is a positive development for the future of democratic accountability in the European Union.

We investigate the dimensionality of politics in the European Parliament by applying a scaling method to all roll-call votes between 1979 and 2001 in the European Parliament. Contrary to most existing studies using these methods, we are able to interpret the substantive content of the observed dimensions using exogenous measures of national party policy positions. We find that the main dimension of politics in the European Union's only elected institution is the classic leftright dimension found in domestic politics. A second dimension is also present, although to a lesser extent, which captures government-opposition conflicts as well as national and European party positions on European integration.