Answer
The Greens, officially known as Bündnis 90/Die Grünen, played a pivotal role in supporting Joachim Gauck's candidacy for the German presidency in 2012. Gauck, a respected pastor and former human rights activist in East Germany, was nominated by a broad coalition of political parties, including the Christian Democratic Union (CDU), Christian Social Union (CSU), Free Democratic Party (FDP), and the Social Democratic Party (SPD).