Italian lawmakers failed to elect a new president in a first round of voting yesterday, leaving Prime Minister Matteo Renzi hoping to push through his candidate only in a fourth round when the required threshold of votes is lower.

Renzi proposed constitutional court judge Sergio Mattarella, 73, to be head of state, a move which angered opposition rival Silvio Berlusconi and may strain the two men’s alliance over electoral and constitutional reforms.

Though a largely ceremonial figure, the Italian President wields important powers at times of political instability, a frequent occurrence in Italy, when he or she can dissolve Parliament, call elections and pick prime ministers.

More than half of the 1,009 parliamentarians and regional officials cast a blank ballot yesterday, preventing any candidate from reaching the required two-thirds majority.

There will be two more rounds of voting today which are also expected to prove inconclusive.

In the fourth round, due on Saturday, only a simple majority is required. It is then that Renzi hopes to secure Mattarella’s election with the backing of his Democratic Party (PD) and centre-left allies.

Berlusconi said his centre-right Forza Italia party would not back Mattarella and accused Renzi of breaking their pact on reforms by not proposing a jointly agreed candidate.

There will be two more rounds of voting today

Mattarella, whose brother was murdered by the Sicilian Mafia in 1980, would be “capable of guaranteeing Italy seven years of distinguished leadership”, Renzi told the PD electors, who backed his choice unanimously.

Mattarella’s political roots are in Italy’s defunct Christian Democrat party. In 1990 he resigned as education minister in protest over a decree which favoured Berlusconi’s media empire.

Renzi’s choice of Mattarella has pleased Renzi’s left-wing critics in the PD. They strongly oppose his reform alliance with Berlusconi, who they say should have been isolated from politics after a 2013 conviction for tax fraud.

The candidate garnering most support in yesterday’s ballot was Ferdinando Imposimato, a senior magistrate proposed by the anti-establishment 5-Star Movement, who received 120 votes.

On paper, Renzi has the numbers to get Mattarella elected in the fourth round, but the voting is conducted by secret ballot and has shades of intrigue reminiscent of the papal conclaves which take place across Rome’s Tiber River.

Italy’s previous president, Giorgio Napolitano, 89, who resigned this month, used his powers to the full, intervening in 2011 to replace a scandal-weakened Berlusconi with ex-EU commissioner Mario Monti at the height of the euro debt crisis.

Napolitano appointed three unelected premiers in all.

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