In 2000 Kristian Vigenin was elected to the Supreme Council of the Bulgarian Socialist Party and in the end of 2001 became a member of the Executive Bureau of the Party. Since 2003, he was a full member of the Socialist International and a member of the Party of European Socialists, since 2005.
Kristian Vigenin was elected to the Bulgarian Socialist Party's supreme governing body in 2000, and by the end of that year, he joined the party's top leadership. He has been a full member of the Socialist International and the Party of European Socialists since 2003.