Klaus Wowereit (born 1 October 1953) is a German politician, member of the SPD (Social Democratic Party), and was the Governing Mayor of Berlin from 21 October 2001 to 11 December 2014. In 2001 state elections his party won a plurality of the votes, 29.7%. He served as President of the Bundesrat (the fourth highest office in Germany) in 2001/02. His SPD-led coalition was re-elected in the 2006 elections; after the 2011 elections the SPD's coalition partner changed from the Left to the Christian Democratic Union. He was also sometimes mentioned as a possible SPD candidate for the Chancellorship of Germany (Kanzlerkandidatur) in the next German federal election, but that never materialized.