The 2006 Italian general election was held on 9 and 10 April 2006. Romano Prodi, leader of the centre-left coalition The Union, narrowly defeated the incumbent Prime Minister Silvio Berlusconi, leader of the centre-right coalition House of Freedoms. Initial exit polls suggested a victory for Prodi, but the results narrowed as the count progressed. On 11 April 2006, Prodi declared victory; Berlusconi never conceded defeat and an ensuing dispute formed. Preliminary results showed The Union leading the House of Freedoms in the Chamber of Deputies, with 340 seats to 277, thanks to obtaining a majority bonus (actual votes were distributed 49.81% to 49.74%). One more seat is allied with The Union (Aosta Valley) and 7 more seats in the foreign constituency. The House of Freedoms had secured a slight majority of Senate seats elected within Italy (155 seats to 154), but The Union won 4 of the 6 seats allocated to voters outside Italy, giving them control of both chambers. On 19 April 2006, Italy's Supreme Court of Cassation ruled that Prodi had indeed won the election, winning control of the Chamber of Deputies by only 24,755 votes out of more than 38 million votes cast, and winning 158 seats in the Senate to 156 for Berlusconi's coalition. Even so, Berlusconi refused to concede defeat, claiming unproven electoral fraud. Electoral campaign During the election campaign, a political battle began between Romano Prodi, who led the centre-left coalition The Union and had been President of the European Commission from 1999 to 2004 and Prime Minister of Italy from 1996 to 1998. On the other hand, Silvio Berlusconi led the centre-right House of Freedoms; Berlusconi had been the incumbent Prime Minister since the 2001 general election, and had previously served as Prime Minister also in 1994 and 1995. House of Freedoms The House of Freedoms was the coalition supporting the incumbent government led by Prime Minister Silvio Berlusconi, and mainly included the same parties as in the previous general election. The New Italian Socialist Party (NPSI), a small social-democratic party composed of former members of the late Italian Socialist Party and led by former 1980s and 1990s minister Gianni De Michelis, which was part of the Berlusconi III Cabinet as a minister without portfolio, suffered a split on its last national congress (21 to 23 October 23, 2005), with a left-wing faction, led by Bobo Craxi, son of the late Bettino Craxi,