For the Senate, 237 single-seat constituencies were established, even if the assembly had risen to 315 members. The candidates needed a landslide victory of two thirds of votes to be elected, a goal which could be reached only by the German minorities in South Tirol. All remained votes and seats were grouped in party lists and regional constituencies, where a D'Hondt method was used: inside the lists, candidates with the best percentages were elected.
Mathematically, the election seemed to give the same results of four years before, the three major parties receiving quite the same preferences. However, the success of the operation of the National Right by anti-constitutional, neo-fascist MSI, gave a golden share to the PSI, because the Christian Democrats had no more possibilities to look at their right to build a democratic government, the alliance with the Socialists becoming quite obliged. Incumbent Prime Minister Giulio Andreotti tried to continue his centrist strategy, but his attempt only lasted a year. Former Premier Mariano Rumor so returned at the head of the government with his traditional centre-left alliance between DC, PSI, PSDI and PRI, but he was abandoned by the Republicans after eight months. He continued with a new squad, but he couldn't withstand the shocks deriving by the divorce referendum of 1974. After the consequent great controversies between Catholics and secularists, former Premier Aldo Moro persuaded the Socialists to accept a minority government composed only by the Christian Democrats and the Republicans. However, new problem arose from the regional elections of 1975, which marked a great success of the left, which consequently called for new national elections. When the Republicans too left Moro in 1976, no possibilities of a new government remained, and a fresh, early vote was obliged to be celebrated.