Pro Patria Union
The SDE is committed to the social market economy model, in addition to conventional social-democratic values including equality, social justice, solidarity, and the welfare state. On 10 May 2005 former social-liberals Peeter Kreitzberg and Sven Mikser joined them. On 28 November former social-liberal Mark Soosaar re-joined the SDE. The party was in opposition from 2002 on, but they participated talks for a common alternative presidential candidate to Arnold Rüütel, SDE's Toomas Hendrik Ilves was elected on 23 September 2006 as the next president of Estonia (apart from the Social Democrats, he was supported by the Reform Party of Estonia, Pro Patria Union and Res Publica deputies).