The electoral success of PSDB and its candidates for the governorship of the state of São Paulo goes back a long way. This study aims to contribute to the discussion regarding that party"s maintenance of political power in that state. In order to do so, we studied the victories of Geraldo Alckmin, who won three (2002, 2010, and 2014) of the six elections that have taken place since 1994, the year in which Mário Covas earned toucans their first term of office in the state of São Paulo. In order to assess the determining factors for Alckmin"s state victories, we worked with four research hypotheses. The first hypothesis is that local socioeconomic indicators in some way affect the proportion of votes obtained municipally by the PSDB candidate, increasing or decreasing it. From the formulation of three generalized linear logistic models (GLM)one for each election -, we assessed the relevance of indicators such as years of education and Gini coefficient to the variation in data relating to vote proportion. By reconstructing the context of each election, the second hypothesis intends to examine the electoral importance of the alliances that PSDB has consolidated in the state of São Paulo, believing that the coalition with heavyweight parties and leaderships can benefit the party and its candidates. The easiness with which Alckmin has gathered allies, by being attentive, and captivated voters, with the help of a wholesome, family-oriented guy image, certainly benefits him, and that is what the third hypothesis addresses. Finally, the fourth hypothesis works on the idea that PSDB"s electoral success in São Paulo is, furthermore, a result of the difficulty PT (Worker"s Party), currently the major oppositional party, has in establishing candidacies that are viable in the eyes of voters, a difficulty aggravated by the dissemination of an anti-PT sentiment by media of significant audience in that state. We have concluded that even though statistical models of each electoral year indicated some socioeconomic indicatorssuch as years of education, aging index, and Gini coefficient -as significant to Alckmin"s votes, they clarify very little about the total variation in vote proportion. That demonstrated that other contextual factors, such as those presented by the other hypotheses and unrelated to socioeconomic structure, do have an impact on Alckmin"s electoral success in São Paulo.