[8] She also professes herself to be a constitutionalist, a feminist, a pro-Europeanist, a progressive, a Spanish patriot, a reformist and an upholder of liberal democracy.

[18][19] Furthermore, she defines herself as a "radical democrat who strives for democracy's regeneration by playing according to the rules";[20] expressed differently, as a "pro-institutional leader whose radical politics, moderate in form and revolutionary in essence, bothers the establishment", for she wants to "transform politics by bringing off substantial, in-depth changes from within institutions".

In 2007 she gave up her seat and left the PSOE particularly due to disagreement on what she perceived to be the Socialists' drift on individual liberties.

She founded a new political party called Unión, Progreso y Democracia in Spanish and Union, Progress and Democracy in English (UPyD), based on the existing movement of Basque citizens against ETA violence ¡Basta Ya!.

[25] On 24 May 2015, she announced she would not seek reelection as spokesperson of UPyD due to the party's poor performance in the regional and municipal elections.