On 7 December 2003, Pligin was elected to the
State Duma, becoming a member of the United Russia faction, and was the chairman of the State Duma Committee on constitutional legislation and state building. On 2 December 2007, he was re-elected as member of the State Duma of the fifth convocation as part of the federal list of candidates put forward by the All-Russian political party United Russia, and became chairman of the same committee. He was a member of the General Council of the United Russia WFP, later joined the Supreme Council of United Russia, and was an author of a number of articles and books, co-author of the textbook "State Property Management". In 2010, he took second place in the rating of deputies-lobbyists of the Russian edition of
Forbes magazine. On 12 May 2014, Pligin was included by the
European Union in the "sanctions list" of persons whose assets are frozen in the EU and for whom visa restrictions have been introduced. In the
2016 Russian parliamentary elections, Pligin took fifth place in the United Russia territorial group for
Saint Petersburg. Due to the low turnout from the group, only two mandates were delegated to the State Duma, Pligin could retain a seat in parliament only if the mandate of Prime Minister
Dmitry Medvedev was transferred. He left the State Duma by the end of the year. In 2017, he became an advisor to the Chairman of the State Duma, and was a member of the Russian Analytical Committee. In January 2019, he has been appointed a deputy chairman of the Commission of the Presidium of the General Council of the
United Arab Emirates for international activities. By the decision of the VII Congress of the Association of Lawyers of Russia, which took place on December 3, 2019, in Moscow, Pligin, a leading researcher at the
Institute of State and Law of the
Russian Academy of Sciences, was elected Chairman of the Association of Lawyers of Russia for the next term of office.
Sanctions He was sanctioned by the
UK government in 2014 in relation to the
Russo-Ukrainian War. ==Legislative initiatives==