Formerly a federal prosecutor based on Santa Fe City, she accompanied Governor Hermes Binner's candidacy within the Progressive, Civic and Social Front on 2 September 2007 elections.
Her investigations helped find the corpses of fifteen "disappeared" people in the cemetery of Santa Fe, and shed light on crimes committed under the command of Provincial Police Chief Agustín Feced in Rosario.
[1] Tessio reminisced about her father when she accepted the nomination, talking about his ethical commitment: "I want to bring forth his memory because he was the one who taught me to be what I am and to believe in those old good truths which haven't been lost to us through postmodernity, globalization, injustice or the frivolization of politics.
"[3] Tessio was chosen to be a candidate as part of an agreement between the main members of his party front, the Socialists and the Radicals.
Although a faction of the Radical Civic Union initially fought to select a party affiliate, governor candidate Hermes Binner insisted, first, that his running mate should be a woman, if possible from the provincial capital, and then named her directly.