[2][3] Elected to represent the Biscay constituency, she campaigned on a pro-independence platform, vowed to give a voice to the recently banned political party Batasuna, and refused to condemn the terrorist activities of ETA.
Eight other EHAK candidates were also elected, a "surprise" performance for the recently formed party.
[2][4] In parliament, Aranburu sat as a member of the Left Nationalist Group and was a member of the Committee on Women and Youth.
[1] EHAK was officially banned in 2008, forcing Aranburu and the other deputies to sit as members of a different party.
[1] Later that year, Aranburu was forced to testify before a judge of the Superior Court of Justice of the Basque Country [es] who was investigating the relationship between EHAK "with the alleged crimes of collaboration with a terrorist organization, illegal association, fraud of subsidies and embezzlement of public funds ... to contribute to the activity and allegedly terrorist purposes of Batasuna-ETA".