 Following his re-election in 2002, he became a full member of the Supervisory Board of the Social Debt Amortizement Fund and the Supervisory Board of the Agency for Industrial Innovation.Besson was appointed the PS National Secretary for the Economy, Employment and Business in 2003, and National Secretary for the Economy and Taxation in 2005.Besson began the 2007 French presidential election as a member of Ségolène Royal's campaign team.