Overview
- The CIS published its May barometer on Friday, May 29, showing the PSOE as the most-voted party at about 36.2% and the PP at roughly 24.9%.
- The institute completed fieldwork on May 18, which means the survey did not capture later judicial events including an Audiencia Nacional order naming José Luis Rodríguez Zapatero and a UCO entry into PSOE headquarters.
- The barometer records short-term shifts with the PP up 1.3 points and Vox recovering 1.5 points to near 16.2%, while Sumar falls to about 5.7% and Podemos sits around 2.5%.
- Several outlets note the CIS figures diverge from private polls and warn the public snapshot may be outdated because the post-survey judicial revelations could change voter perceptions and coalition dynamics.
- Analysts say the key follow-ups to watch are how ongoing probes affect the PSOE’s standing with parliamentary partners and whether new private polls show movement that would alter the balance of support in Congress.