Cómo concurre la izquierda a las elecciones en cada circunscripción

The Spanish Socialist Workers' Party (PSOE) has finalized plans to run in coalition with various left-wing parties for the majority of Senate constituencies in the upcoming elections. Conversely, the electoral landscape for the Congress of Deputies remains fragmented, as the PSOE intends to run independently in those races.

Negotiations between other left-wing factions have resulted in limited cooperation. Specifically, Frente Amplio and Podemos have reached agreements to run as a coalition only in the Canary Islands, while maintaining separate electoral paths in other regions.