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This time, however, the electoral game has changed.
Support for the previous winner, the conservative People's Party (PP), has collapsed amid a corruption scandal. Its main opponent, the Socialist party, has rocketed to the top of the polls after seizing the prime minister's job last year.
Podemos on the left and Ciudadanos (Citizens) on the right are seeing their support fall, amid a boom for the controversial far-right Vox party.
One recent poll showed almost half of voters - 40% - had yet to make up their minds.