The President of the Italian Republic is the head of state of Italy and, in that role, represents national unity and guarantees that Italian politics comply with the Constitution. The president's term of office lasts for seven years. The 11th President of the Republic, Giorgio Napolitano, was elected on the fourth round of legislative balloting, on 10 May 2006 and elected to a second term on the sixth round with 738 votes, much more than the 504 necessary for a simple majority on 20 April 2013. On 31 January 2015, the incumbent President, former constitutional judge Sergio Mattarella, was elected at the fourth ballot with 665 votes out of 1,009.