Legislative election results map. Yellow denotes provinces with a Christian Democratic plurality, Red denotes those with a Communist plurality, Dark gray denotes those with a South Tyrolean People's Party plurality.
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.
Face to the great result of the PCI, many centrist politicians and businessmen began to think how to avoid the possibility of a future Communist victory which could turn Italy into a Soviet-aligned State. So the DC leadership thought to gradually involve the Communists into the governmental policies so to moderate their requests, as made with the Socialists. The man which was chosen for this attempt did not belong to the leftist wing of the DC, as happened with the PSI, but the moderate leader and former-PM Giulio Andreotti, so to balance the situation and to calm the markets. Its first government ended in 1978, when the PCI decided to grant its external support. However this process, called National Solidarity, was dramatically stopped by the terroristic attacks of the Red Brigades, which kidnapped and killed former-PM Aldo Moro. The country was heavily shocked by these killings, and the Communists returned to a full opposition. Andreotti's attempt then to form a classic centre-left government with the Socialists failed, an a new general election was called for 1979.