CNN  — 

With Italy mired in post-election gridlock, Pier Luigi Bersani told Italian President Giorgio Napolitano on Thursday that he has been unable to form a new government, state news agency ANSA reported.

Bersani fared the best in the February elections by leading a leftist coalition to a small majority in the lower house of parliament. But he was unable to win a majority in the Senate.

Instead, power in the Senate was divided between Bersani and the center-right coalition of his rival, former Prime Minister Silvio Berlusconi, which is anchored by his party, Popolo della Liberta, or People of Freedom.