This is much more a european-centric movement akin to Siriza in Greece than it is a spanish speaking thing. Southern Europe got hit hard by the recession and southern states were semi-forced into adopting austerity policies by the european union. The success or failure of the new greek governement will probably have a large influence in the fate of Podemos in the next election. In the end, it's about reconfiguring the coalition that governs europe more than it is about anything else. Europe is a quasi federal state where the Senate (i.e. the European Council, representing state governements) has the bulk of the power.