 In 1998, he resigned from the National Liberal Party and joined the Democratic Party.In the 2000 elections, he was re-elected on the lists of the Democratic Party, being a deputy until 2004.Liviu Negoiţă was the candidate of the Democratic Party for mayor of Bucharest's Sector 3, Bucharest's most populous sector, winning the 2004 elections, keeping his seat after he won the 2008 local elections with 79.05%.