 In the 2006 municipal elections, Gronkiewicz-Waltz served as Civic Platform's nominee for mayor of Warsaw.On 12 November she gained 34.23%, finishing next to Law and Justice candidate, former Prime Minister Kazimierz Marcinkiewicz.As neither received 50 percent of the vote, a second round election was held on 26 November, where Gronkiewicz-Waltz received 53.18% of the votes, winning the election.