The 2004 Hamburg state election was held on 29 February 2004 to elect the members of the 18th Hamburg Parliament. The election was triggered by the collapse of the coalition government between the Christian Democratic Union (CDU), Party for a Rule of Law Offensive (PRO), and Free Democratic Party (FDP). The election saw a collapse in support for PRO which had split after its leader Ronald Schill left in 2003. The original party and Schill's new party captured 3.5% of the vote between them, down from 19.4% in 2001. A huge amount of support flowed to the CDU, which won 63 of the 121 seats in Parliament, forming a majority government. First Mayor Ole von Beust continued in office.