"Since May 2011, the Spanish 15-M Movement (commonly referred as los indignados [the outraged]) has become a major player in the domestic political scenario. Public opinion data reveal that there is a cross-sectional support for the 15-M among the general population in Spain, affecting people of different ages, genders, employment situations and levels of urbanization. The data present a “movement of dissent” and confirm the crisis of the consensual culture of the Spanish political transition from Franco's regime to democracy. The 15-M challenges previous consensus and expresses the need to reform or to overcome the close-knitted institutional map designed by the elites driving the transition. The outraged movement advances and leads a new political culture based on widespread social dissent. Our data suggest an imbalance between the cultural and the political impact of the 15-M, and how this tension will be a central element of cultural and civic life in the next decades in Spain."