 The result shocked the PSI's leadership, causing the sudden sinking of the social-democratic federation, and an alternance of provisional retirements by the government, firstly led by lifetime senator Giovanni Leone and then, through two political crisis, by DC's secretary Mariano Rumor.Unsuccessfully trying to recover its lost leftist electors, the PSI returned to the alliance with the PCI for the regional elections of 1970, so causing another crisis and a new change of premiership, then led by Emilio Colombo, but the government coalition had continuous problems of instability.Influent Giulio Andreotti tried to resurrect the centrist formula in 1972, but he failed, opening the way to the first early election of the republican history.