The Social Democratic Party (, SDE) is a centre-left political party in Estonia. It is currently led by Lauri Läänemets. The party was formerly known as the Moderate People's Party (). The SDE has been a member of the Party of European Socialists since 16 May 2003 and was a member of the Socialist International from November 1990 to 2017. It is orientated towards the principles of social-democracy, and it supports Estonia's membership in the European Union. History During the perestroika era, the Estonian Social Democratic Party (Eesti Sotsiaaldemokraatlik Partei, ESDP) was formed as Estonia's social-democratic movements merged in 1990. The movements were: the Estonian Democratic Labour Party, the Estonian Social Democratic Independence Party, the Russian Social Democratic Party of Estonia and the Estonian Socialist Party's Foreign Association (successor of Estonian Socialist Workers Party in exile). The ESDP's first leader was Marju Lauristin. They restored their contacts with the Socialist International in 1990. ESDP formed an electoral alliance with the agrarian Estonian Rural Centre Party (formed in 1990) for 1992 and 1995 elections. In 1996, after electoral defeat these two parties finally merged and named themselves the Moderates (Mõõdukad). The Moderates were accepted as a full member of the Socialist International at its 20th congress in September 1999. In 1999 the Moderates and the centre-right People's Party, set up in May 1998 after a fusion of Peasants' Party and People's Party of Republicans and Conservatives (a 1994 splinter group from the Fatherland Alliance), formed the Moderate People's Party (Rahvaerakond Mõõdukad). The seemingly unlikely decision to fuse took place on 29 May 1999, with some foreign commentators drawing parallels with 'right-wing socialists'. In November the same year, the unification was formally approved by party's general assembly. The Moderates' contacts with People's Party predecessors had started in 1998. The two parties had a joint list in 1999 parliamentary election and formed a governing coalition with Pro Patria Union and Reform Party. In 2003, the Moderate People's Party joined the Party of European Socialists. After disappointing election results in 2003, the party renamed itself the Social Democratic Party (SDE) on 7 February 2004. It was the most successful party in the 2004 European Parliamentary Election, obtaining 36.8% of the national vote (most of which went to their leading candidate Toomas Hendrik Ilves) and returning 3 MEPs. The SDE is committed to the social market economy model, in addition to conventional social-democratic values including