The PSOE would suffer its biggest electoral setback of the legislature and lose eight seats in just one month. This is reflected in the latest general election poll by Sigma Dos for El Mundo, which places the socialists at 26.4% of the vote and 108 deputies, thirteen fewer than obtained in the general elections of July 2023.
The fall of the PSOE mainly benefits the right-wing bloc. The PP would consolidate its lead over the socialists with 140 seats and Vox would maintain its upward trend to 60 deputies. The sum of both formations would reach 200 representatives in Congress, 24 above the absolute majority and 30 more than obtained in the last general elections.
The poll, based on 1,994 interviews conducted between June 1 and 11, coincides with a period of strong wear and tear for the Government and reflects the worst electoral performance of the PSOE since the beginning of the year.
PSOE loses eight seats and widens PP's lead
The main conclusion of the survey is the strong socialist setback compared to the May barometer. According to Sigma Dos, the PSOE would go from 28.4% to 26.4% of the vote in just one month, which would translate into a loss of eight deputies. Meanwhile, the PP would slightly improve its results and widen the gap with the socialists. The PP's lead over the PSOE would rise to 6.2 percentage points, well above the 1.4 percentage point difference recorded in the general elections of July 2023.
The poll also detects the largest transfer of votes from PSOE to PP and Vox of the entire legislature. The data published by El Mundo reflect that 8.8% of those who voted for PSOE in 2023 would now choose the PP, while another 4.5% would opt for Vox.
Overall, more than 13% of the socialist electorate from the last general elections would move to right-wing parties. PSOE's vote loyalty falls to 66.9%, its lowest level of the legislature.
The most relevant vote transfers would be the following:
• PSOE → PP: 8.8%.
• PSOE → Vox: 4.5%.
• PP → PSOE: 1.5%.
The poll also reflects a reduction in the percentage of former socialist voters who declare themselves undecided, suggesting a consolidation of the changes detected in previous polls.
PP and Vox consolidate a comfortable majority
The sum of PP and Vox would reach 200 deputies, a figure that far exceeds the absolute majority in Congress, set at 176 seats. The evolution reflects a profound reconfiguration of the political space, with Vox consolidating itself as the main beneficiary of the government's wear and tear. The poll also grants two seats to Aliança Catalana, which would enter Congress after doubling its support compared to the previous month.
On the contrary, Sumar and Podemos barely capitalize on the fall of the PSOE. The formation led by Yolanda Díaz would retain its 10 deputies, while Podemos would keep two.
Source: Sigma Dos for El Mundo, published on 06/14/2026.
| PARTY | % VOTES |
| PP | 32.6 |
| PSOE | 26.4 |
| Vox | 17.2 |
| SUMAR | 7 |
| PODEMOS | 3.4 |