Résumé : The topic of this dissertation is the democratic deficit of the European Union and the normative and empirical assessment of the likelihood that the existing forms of institutionalized transnational civic engagement would act as the point of anchoring democratic practices at the EU level. If the democratic deficit reflects the apparent lack of legitimacy and accountability of EU institutions and a lack of influence of its citizens, the question the project attempts to answer is why the existing democratic innovations within the EU constitutional framework fail to attract political allegiance and mobilization necessary for a functioning EU democracy? The thesis attempts to bridge the gap between normative political theory and more empirical and policy oriented approaches to the issue of EU democratic deficit. In a theoretical sense, this research covers a broad spectrum of topics within political theory and the theory of political culture. Parting ways with most of the current literature on the subject, which usually ends with institutional prescriptions derived from descriptions that rely on the nation-state as the benchmark for the prospects of democratisation of the EU, the project seeks to analyse the democratic innovations that the Lisbon treaty introduced within a more comprehensive framework of transnational deliberative democracy - demoicracy. The underlying idea behind the project is to apply, for the first time and with necessary modifications, the basic notions of the founders of the discipline of Political Culture, Almond and Verba, to the EU. That means to draw on their seminal work, ‘The Civic Culture: Political Attitudes and Democracy in Five Nations’, and hypothesize that further democratization of EU decision-making requires a 'civic political culture'. By definition, it presupposes the dominance of 'participative' over 'subject' and 'parochial' dimensions of orientation towards the political system. After extensive theoretical and methodological considerations, following a brief investigation into political culture in the EU, the empirical focus shifts to the European Citizens’ Initiative and the framings around the struggle for its reform in order to draw findings on which types of political cultures the European Commission has fostered. The principle aim of the research is to investigate if and how the democratic legitimacy of the EU can be enhanced by a shift from a parochial and subject to a more participation-enhancing dynamics.