 After the 2005 federal election, Künast became co-chair of the Green Party's parliamentary group, again together with Fritz Kuhn and later with Jürgen Trittin.Künast announced on 5 November 2010 that she we would be the candidate for Governing Mayor of Berlin for Alliance '90/The Greens in the 2011 Berlin state election.At the time of the announcement, her party was eight percentage points ahead of the Social Democrats in the opinion polls.