Supporters wave party flags outside the villa of Italian centre-right leader Silvio Berlusconi in Arcore, near Milan, April 14, 2008. Conservative billionaire Silvio Berlusconi won a third term as Italy's prime minister on Monday with an unexpectedly strong mandate to deal with deep economic and social problems. REUTERS/Alessandro Garofalo (ITALY)

Italy's centre-left leader Walter Veltroni concedes defeat at the Democratic Party (PD) headquarters in Rome April 14, 2008. Veltroni conceded defeat to conservative Silvio Berlusconi in Italy's parliamentary election on Monday. REUTERS/Tony Gentile (ITALY)

Italy's centre-left leader Walter Veltroni concedes defeat at Democratic Party (PD) headquarters in Rome April 14, 2008. Veltroni conceded defeat to conservative Silvio Berlusconi in Italy's parliamentary election on Monday. REUTERS/Giampiero Sposito (ITALY)

Italy's centre-left leader Walter Veltroni (5th R) stands with his Democratic Party (PD) members as he concedes defeat at the party headquarters in Rome April 14, 2008. Veltroni conceded defeat to conservative Silvio Berlusconi in Italy's parliamentary election on Monday. REUTERS/Tony Gentile (ITALY)

Italy's centre-left leader Walter Veltroni concedes defeat at Democratic Party (PD) headquarters in Rome April 14, 2008. Veltroni conceded defeat to conservative Silvio Berlusconi in Italy's parliamentary election on Monday. REUTERS/Giampiero Sposito (ITALY)

The shadow of Italy's centre-left leader Walter Veltroni is seen on a wall as he leaves his office at Democratic Party (PD) headquarters in Rome April 14, 2008. Centre-left leader Walter Veltroni conceded defeat to conservative Silvio Berlusconi in Italy's parliamentary election on Monday. REUTERS/Tony Gentile (ITALY)

Italy's centre-left leader Walter Veltroni concedes defeat at Democratic Party (PD) headquarters in Rome April 14, 2008. Veltroni conceded defeat to conservative Silvio Berlusconi in Italy's parliamentary election on Monday. REUTERS/Giampiero Sposito (ITALY)

Italy's centre-left leader Walter Veltroni concedes defeat at the Democratic Party (PD) headquarters in Rome April 14, 2008. Veltroni conceded defeat to conservative Silvio Berlusconi in Italy's parliamentary election on Monday. REUTERS/Tony Gentile (ITALY)

Italy's centre-left leader Walter Veltroni leaves his office before conceding defeat at Democratic Party (PD) headquarters in Rome April 14, 2008. Veltroni conceded defeat to conservative Silvio Berlusconi in Italy's parliamentary election on Monday. REUTERS/Tony Gentile (ITALY)

Italy's centre-left leader Walter Veltroni (R), standing next to his team mates Rosi Bindi (L) and Anna Finocchiaro, concedes defeat at Democratic Party (PD) headquarters in Rome April 14, 2008. Veltroni conceded defeat to conservative Silvio Berlusconi in Italy's parliamentary election on Monday. REUTERS/Giampiero Sposito (ITALY)

Italy's centre-left leader Walter Veltroni (L) stands next to Democratic Party (PD) Vice Secretary Dario Franceschini as he concedes defeat at the party headquarters in Rome April 14, 2008. Veltroni conceded defeat to conservative Silvio Berlusconi in Italy's parliamentary election on Monday. REUTERS/Tony Gentile (ITALY)

Italy's centre-left leader Walter Veltroni concedes defeat at Democratic Party (PD) headquarters in Rome April 14, 2008. Veltroni conceded defeat to conservative Silvio Berlusconi in Italy's parliamentary election on Monday. REUTERS/Giampiero Sposito (ITALY)

Italy's centre-left leader Walter Veltroni (C), flanked by Democratic Party (PD) members, concedes defeat at the party headquarters in Rome April 14, 2008. Veltroni conceded defeat to conservative Silvio Berlusconi in Italy's parliamentary election on Monday. REUTERS/Tony Gentile (ITALY)

Italy's centre-left leader Walter Veltroni (C) leaves his office before conceding defeat at the Democratic Party (PD) headquarters in Rome April 14, 2008. Veltroni conceded defeat to conservative Silvio Berlusconi in Italy's parliamentary election on Monday. REUTERS/Tony Gentile (ITALY)

Italy's centre-left leader Walter Veltroni concedes defeat at the Democratic Party (PD) headquarters in Rome April 14, 2008. Veltroni conceded defeat to conservative Silvio Berlusconi in Italy's parliamentary election on Monday. REUTERS/Tony Gentile (ITALY)

Italy's centre-left leader Walter Veltroni concedes defeat at Democratic Party (PD) headquarters in Rome April 14, 2008. Veltroni conceded defeat to conservative Silvio Berlusconi in Italy's parliamentary election on Monday. REUTERS/Giampiero Sposito (ITALY)

Italy's centre-left leader Walter Veltroni concedes defeat at the Democratic Party (PD) headquarters in Rome April 14, 2008. Veltroni conceded defeat to conservative Silvio Berlusconi in Italy's parliamentary election on Monday. REUTERS/Tony Gentile (ITALY)