Conservative and Francophilic,[1] the PMSD is the fourth biggest political party in the National Assembly and currently forms part of the opposition.

[2] Several decades later Jules Koenig resurrected the party in the form of Union Mauricienne from 1946 to 1953 before being re-branded to Ralliement Mauricien prior to the 1953 Legislative Council Elections.

[5] However with the advent of the newly formed Mauritian Militant Movement (MMM) in the 1970s, PMSD started to lose popularity.

Despite this apparent shrinkage in its base the PMSD managed to form part of ruling government from 1976 to 1982 after contracting an alliance with the Labour Party after the 1976 elections.

As a result Maurice Lesage, Guy Ollivry, Raymond Rivet, Cyril Leckning, Clément Roussety and others left PMSD and created their own party, the Union Démocratique Mauricienne (UDM) which remained active for a number of years thereafter.

In the lead up to elections of 2014, however, the PMSD joined the Alliance Lepep, a coalition comprising the Militant Socialist Movement, the Muvman Liberater, and itself.