The Greek election of May 2012 failed to produce a government, resulting in repeat elections six weeks later. This shock outcome was a symptom of a broader delegitimation of the national political system. Over the past decade Eurobarometer data show a much more extensive loss of confidence in political institutions in Greece than in the European Union as a whole. In a first phase, rising political discontent was managed within the traditional political framework through alternation in power between the two major parties. In contrast, the second phase, following the outbreak of the Greek sovereign debt crisis, led to the dramatic fragmentation of the party system and changed the mode of government formation. This process is not reversible and entails serious democratic dangers.