An indirect presidential election (officially the 9th Federal Convention) was held in West Germany on 23 May 1989. The only candidate was incumbent President Richard von Weizsäcker, who had the support of all four major parties (CDU/CSU, SPD, FDP, and The Greens). It is so far the only time that a presidential candidate ran unopposed. It was also the last presidential election held before German reunification.
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Text from the Wikipedia article “1989 West German presidential election”, available under CC BY-SA 4.0.