A Sunday meeting on a shared Senate list

The Spanish Socialists (PSOE) and representatives of Frente Amplio, the new brand of Sumar, are due to meet on Sunday to study a possible joint candidacy for the Senate. Sources in Frente Amplio confirmed the contacts to La Razón but did not treat any outcome as settled, and one senior representative said "Veremos qué nos dicen y decidiremos qué hacemos". The Socialists want a broader deal that would also cover the lists for the Congress of Deputies, a step they say would make it easier to finish first in the next election. Inside Ferraz, officials admit the task is "muy difícil" but say they understand why their partners will not step back on certain points across Spain. La Vanguardia describes the talks as being at their first steps and full of difficulties, although they have already started.

Why the Senate arithmetic matters

The PP holds an absolute majority in the Senate, which, according to Socialist sources, it has used to set up investigation commissions into corruption cases affecting the PSOE, including the 'caso Koldo'. The PP has also called former minister José Luis Ábalos, his former adviser Koldo García, former party number three Santos Cerdán and Spain's prime minister Pedro Sánchez himself to appear, the last on 30 October 2025. Socialist sources note that in Senate elections the party that wins a province takes three of the four directly elected seats, the second party takes the fourth, and votes for other lists are lost, so a joint left list could shift the balance. In the July 2023 election, of the 208 senators chosen directly by voters, 120 went to the PP and 73 to the PSOE, while neither Vox nor Sumar won seats through that route. El Mundo runs a simulation in which a single PSOE and Sumar list would have won 116 seats against 81 for the PP, though the model assumes Sumar voters would have picked the three nominees in each constituency.

PP120

PSOE73

PP

120 seats

PSOE

73 seats

Data from the article text

Timetable and the 16 October deadline

Sánchez announced the early election on Monday, setting the general vote for 29 November, and he tied the call to the makeup of Parliament. He said:

“I am convinced that if the majority of Parliament turns its back on citizens, citizens must elect a new Parliament. We need a Parliament with a different majority, much broader, and that is the reason for this electoral call.”

The Socialists have until 16 October to decide, under the electoral calendar's deadline for filing coalitions. Frente Amplio still has to choose the candidate it will put forward for the 29 November vote and settle its alliances before any joint Senate list can take shape. Sunday's meeting comes before that deadline.

Civil society pressure and doubts on the left

Earlier this week a civil society initiative, 'Senadoras y senadores por la Democracia', called for a joint left-wing list for the Senate in the 29 November election, with backers including the writer Elvira Lindo, the singer Víctor Manuel and the actor Pepe Viyuela. Sectors of Sumar and its parliamentary allies want to explore that route, but sources say the key is whether the PSOE is willing. Other voices judge a deal difficult, given the short timetable and the fact that alternative left parties are still negotiating how they will run for the Congress. Transport minister Óscar Puente has meanwhile shared on X a guide from an anonymous user arguing that, under the D'Hondt law, a vote does not count the same everywhere, urging left-wing voters in small constituencies such as Cuenca to back the PSOE alone.