Emboldened by their victory in 1991, and encouraged by the unfolding Mani pulite scandals and the substantial loss of votes for the traditional parties in the 1992 general elections, the reformers pushed forward with another referendum, abolishing the proportional representation system of the Italian Senate, implicitly supporting a plurality system that would theoretically force parties to come together around two ideological poles, thereby providing governmental stability. This referendum was held in April 1993, and passed with the support of 80% of those voting. This caused the Amato government to collapse three days later.