Bergeron was a member of the Bloc Québécois in the House of Commons, representing the riding of
Verchères—Les Patriotes from 2000 to November 9, 2005, and
Verchères from 1993 to 2000. Bergeron held many positions as a
Member of Parliament including
whip of the Bloc and critic of Parliamentary Affairs, Intergovernmental Affairs,
Privy Council,
Foreign Affairs, Industry, Science, Research, and Development, International Trade and Asia-Pacific. He resigned his federal seat and won a provincial
by-election on December 12, 2005, under the
Parti Québécois (PQ) banner. He became the member for
Verchères of the
Quebec National Assembly succeeding former Quebec Premier
Bernard Landry in that riding. He was re-elected in the
2007 provincial election. He was named the PQ's critic in parks and environment but was later promoted to the portfolios of families and seniors. From 2021 to 2025 he served as the critic of foreign affairs and international development, international cooperation, Canada-China relations in the
Bloc Québécois Shadow Cabinet. ==Electoral record==