Unidos Podemos: Spain’s leftwing alliance hoping to end political impasse
... Reflecting on the collapse of Spains two main parties in the general election in December, Bustinduy said: What happened was nothing short of revolutionary. Because even with an electoral system that promotes bipartisanship, we have this completely new landscape.
After six months of stalemate and failed coalition talks following the election, Spain finds itself at a historic juncture before the rerun on 26 June. Having come a close third last year with 20% of the vote, Podemos announced an alliance last month with United Left (IU), a leftwing coalition including the PCE, the Communist party of Spain.
They will run on a joint ticket, containing the various Podemos regional franchises, as Unidos Podemos (United We Can). In polls reflecting this new formation, the radical leftwing bloc leapfrogs the formerly dominant centre-left party PSOE into second place, giving it a realistic chance of forming a government.
As was the case in December, the election will probably produce a four-way split, with no party winning a majority. But current polling suggests that a leftwing coalition government of Podemos and PSOE could just beat Mariano Rajoys conservative PP despite it finishing first and fourth-placed Ciudadanos, with Pablo Iglesias, the secretary general of Podemos, as prime minister...
https://www.theguardian.com/world/2016/jun/12/unidos-podemos-spain-election-leftwing-alliance-united-left
Note this alliance also includes Greens...