Rise of Spanish populists overturns two-party system

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* "We Can" party sets up hundreds of assemblies across Spain

* Draws level with two big mainstream parties; leads in some polls

* Government responds with populist-tinged measures

By Julien Toyer

MADRID, Dec 28 (Reuters) - The sudden rise of a new anti-establishment party has transformed Spanish politics a year before a general election, forcing the centre-right government to veer away from austerity and the left-leaning opposition to scramble for new leaders.

In just a year since its founding, the party "Podemos" - We Can - has overturned the two party system in place since Spain embraced democracy in the 1970s. It is now polling around even with the ruling People's Party (PP) and main opposition Socialists, and has even led in some polls.

Prime Minister Mariano Rajoy's PP has unveiled a raft of new, populist-tinged measures, such as an anti-corruption bill, new monthly payments for the long-term unemployed and the first rise in the minimum wage in two years.

The Socialists have replaced their leaders in search of fresh faces that would have more electoral appeal. Further to the left, the former Communists have announced similar plans.

But Podemos activists say the mainstream parties are missing the point: their group offers not just new personalities and a new policy mix, but a whole new way of thinking about politics, giving greater voice to ordinary Spaniards who feel ignored by a political class derided as "la casta" or "the caste".

Podemos has set up hundreds of local assemblies known as "circulos" across the country, staging unruly weekly meetings at which Spaniards can vent the anger built up during worst economic crisis since World War Two.

"The one thing we all share is the outrage over what's going on in Spain," said Jose Luis Soriano, a 32-year old unemployed computer scientist who has been coming to the circulo in the upscale Madrid neighbourhood of Salamanca since the summer.

The Salamanca circulo now has about 500 members. Each week about 50 people attend its meetings in a rented private school classroom. They come from all walks of life and political backgrounds: pensioners, students, housewives, executives.

"I like the fact that they're open to debate, transparent and want to change this rotten system," said Soriano.

Those who attend describe the meetings as an experiment in democracy. There is no leader; members can attend whenever they like and they vote on everything - from organising a Christmas contest with local shops to choosing who will be their representative, to their policy platform in a local election.