He attended high school in the General Paz Military Liceum in Córdoba, and studied Biochemistry at the National University of the Littoral.
Former mayor Horacio Usandizaga, a Radical, had publicly vowed to resign if Carlos Menem was elected President of Argentina.
Upon Menem's success in the 1989 election and Raúl Alfonsín's early departure from office, Usandizaga kept his word, and Cavallero was appointed to complete his term.
Having severed his ties with the Socialist Party, Cavallero remained a supporter of the increasingly conservative and unpopular Menem administration.
He defeated Begnis in the primaries, obtaining more than twice the number of votes; but in the 2 September general election, however, he lost by a landslide to his former collaborator, Socialist Mayor Miguel Lifschitz, who was thus re-elected.