Gosselin supported the
Union Nationale. He won a by-election in 1957 and became the Member of the
National Assembly of Quebec (MNA) for the district of
Compton. He was re-elected in
1960, but his party lost the election against
Jean Lesage's
Liberals. Gosselin supported
Jean-Jacques Bertrand over
Daniel Johnson Sr. during the party leadership convention held in
Quebec City on September 23, 1961. Gosselin was re-elected in
1962 and
1966, but was defeated in
1970. ==Federal politics==