He became president of the Parliament of Berlin (1955) and Mayor of Berlin (1957). Willy Brandt started to campaign for the position as Chancellor (Bundeskanzler) for the Social Democrats (SPD) in 1961. In 1966, he became Vice-Chancellor of the "Grand Coalition" of SPD and the Christian Democratic Union of Germany (CDU) under Chancellor Kurt Georg Kiesinger. He started the social-liberal coalition between the SPD and the Free Democratic Party of Germany (FDP). Willy Brandt became Chancellor in 1969.