 In the 2015 Riojan regional election, Andreu was the candidate of the Spanish Socialist Workers' Party (PSOE) for President of La Rioja, and PSOE obtained 10 seats out of 33, while the People's Party (PP) obtained 15.Andreu was subsequently the parliament spokesperson for PSOE.In the 2019 Riojan regional election, Andreu repeated as PSOE's candidate for President of La Rioja.