This is shown by the latest barometer from the Centre for Sociological Research (CIS), covering September. The survey was conducted between the 1st and 4th of this month, with 4,042 interviews carried out in 1,111 municipalities, including 21 in Ceuta, and a margin of error of ±1.6% for the sample as a whole.
Specifically, the study puts the PSOE at 31% voting intention, compared with the 33% it achieved two months ago. Meanwhile, the PP rises from the 25.1% assigned to it by the institution headed by José Félix Tezanos at the time to 25.5%.
Vox has also experienced an increase in support, rising from 15.3% in July to 16.6%. By contrast, Sumar, the government's coalition partner, loses four-tenths over these two months.