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Maza served as minister and collaborator of former President and La Rioja governor Carlos Menem, whose family dominated local politics. However Maza switched to support the Front for Victory faction of fellow Peronist President Néstor Kirchner. In 2006, Maza won the primary elections to head the Justicialist Party of La Rioja, defeating the Menemist candidate. This was seen as a final defeat against Carlos Menem by Kirchner.