The election resulted in a surprise result for both Núñez Feijóo, who enlarged his absolute majority from 38 and 41 seats, and Beiras' coalition AGE, which won 200,000 votes and 14% of the share, scoring in third position. In contrast, the Spanish Socialist Workers' Party obtained one of the worst results in the history of the party in Galicia. All in all, the enlarged PP majority came as a result of the enormous fragmentation of the left vote within several parties, as Feijóo's party lost almost 130,000 votes from 2009.
The 75 members of the Parliament of Galicia were elected in 4 multi-member districts using the D'Hondt method and a closed-listproportional representation. Each district was entitled to an initial minimum of 10 seats, with the remaining 35 seats being allocated among the eight provinces in proportion to their populations. Only lists polling above 5% of the total vote in each district (which includes blank ballots—for none of the above) were entitled to enter the seat distribution.
Under Article 8 of the Galician Electoral Law, the boundaries of the electoral districts were to be the same as the provinces of Spain, which, under Article 141 of the Spanish Constitution of 1978, could only be altered with the approval of the Congress of Deputies.
The apportionment of seats to provinces followed the largest remainder method over the resident population ("Padrón") with a minimum of 10 seats.
The election was held amid a climate of falling popularity in Mariano Rajoy's government, with the electoral campaign being heavily marked by the austerity measures approved by the People's Party government. In July 2012, a 65 billion euros worth spending cut and a VAT rise from 18% to 21% was passed; such measures being heavily criticised because they were a breach of a key election promise. The PP vote share immediately plummeted in opinion polls from 40% to 34%. This raised fears within Núñez Feijóo's regional government about the possibility of losing the party's absolute majority in the Galician Parliament election scheduled for early 2013.
On 21 August 2012, Basque premier Patxi López announced that he was bringing forward the Basque election date to 21 October 2012, after the People's Party had announced that it was withdrawing its support to Lopez' Socialist government in the Basque Country. As a result, President Feijóo announced that he was calling the election earlier in order for it to coincide with the Basque election.
Poll results are listed in the table below in reverse chronological order, showing the most recent first. The highest percentage figure in each polling survey is displayed in bold, and the background shaded in the leading party's colour. In the instance that there is a tie, then no figure is shaded. The lead column on the right shows the percentage-point difference between the two parties with the highest figures. Poll results use the date the survey's fieldwork was done, as opposed to the date of publication. However, if such date is unknown, the date of publication will be given instead.
Opinion polls showing seat projections are displayed in the table below. The highest seat figures in each polling survey have their background shaded in the leading party's colour. In the instance that there is a tie, then no figure is shaded. 38 seats are required for an absolute majority in the Parliament of Galicia.
^ abcdefghPoll results are shown projected over candidacy votes (that is, votes going for political parties, excluding blank ballots). The vote percentage in the official election is calculated including blank ballots into the estimation. In order to obtain data comparable to both the official results as well as those of other polls, a rule of three has been applied to the poll projections, with the results of the calculation being shown instead.