Marcel Rogemont and other young socialist elected officials gathered around
Edmond Hervé at the time of his conquest of the town hall of
Rennes in 1977. With them, he deeply marked the local political scene from then. He held uninterrupted office in the municipal council of Rennes from 1977 to 2001. He was one of the assistant mayors from 1977 until his first election as deputy in 1997. He successively was in charge of the personnel, of finances then of culture. Member of the Socialist party until 22 May 2007, he was excluded from it following his dissenting candidature against Laurence Duffaud, official candidate of the PS. He was elected on 17 June 2007, for the XIIIth legislature (2007–2012), in the
3rd district of Ille-et-Vilaine by beating, at the second round, the outgoing deputy Philippe Rouault (UMP) with 52,75% of the votes. He was elected to the department's new
8th constituency in 2012, but did not contest it at the
2017 election. ==References==