In Italy the President is not elected by the people but by the Parliament: this is called “indirect election” or “second level election”.
The deputies and the senators, convened in a joint session, vote in a secret ballot, which has traditionally been a perfect opportunity to wage internal wars between factions of the same party. More usually than not, the minority will betray (“shoot”) the official party candidate chosen by the majority. The “shooting” MPs are called “franc tireurs”.
Prime Minister Renzi has been a burdensome leader for the Democratic Party, discarding old traditions, isolating old officers and creating a good deal of discontent. Whoever his candidate is, he or she will be afraid until the very last vote.