Italian President Giorgio Napolitano has appealed to political leaders for “realism, a sense of responsibility” in resolving their post-election deadlock, the BBC reported. Almost a week after Italians voted, the three biggest blocs are struggling to find common ground. Beppe Grillo, head of the Five-Star Movement (M5S) which emerged as the biggest party, has rejected an alliance with the centre-left and centre-right. But he says he is prepared to prop up a coalition, on a vote-by-vote basis. Centre-left Democratic Party (PD) leader Pier Luigi Bersani, whose coalition won most seats in the lower house of parliament., insisted on Friday that he would never join a grand coalition with the centre-right bloc led by former PM Silvio Berlusconi.