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The Mongolian Social Democratic Party (Mongolian: Монголын Социал Демократ Нам; Mongolyn Sotsial Demokrat Nam, sometimes also referred to as Sotsdek nam) is a political party in Mongolia. It was founded in 1990 by Bat-Erdeniin Batbayar. Other prominent members included A.Ganbaatar, Losolyn Byambajargal and Radnaasumbereliyn Gonchigdorj. A considerable number of members came from the mathematics and physics departments of Mongolia's National University. The party was part of the Mongolian Democratic Union that ruled from 1996 to 2000.
It merged with the Democratic Party in 2000, thus all of the Social Democratic Party became members of the Democratic Party except A.Ganbaatar.
It is not to be confused with the Mongolian Democratic New Socialist Party, which is another name for the Motherland Party.
The MSDP ran 19 candidates, but did not win any seat at the 2012 Mongolian parliamentary elections.
Mongolian Social Democratic Party web site (in Mongolian)