The current National Assembly, formed following elections held on 1 July 2012, has a total of 150 elected members who serve five-year terms. The electoral system is a mixed member majoritarian (MMM) system. Ninety deputies are elected in 35 single and multi-member districts (departments) by simple majority (plurality) party block vote (PBV, winning party list takes all seats in the district). The remaining 60 seats are filled proportionally based on the national distribution of votes. Voters have a single ballot and vote for the party list. This single ballot is applied to both the majoritarian and proportional vote counts.
The Senegalese Progressive Union (UPS) was the Socialist Party's predecessor.
Senegal was a one party state from 1966 to 1974. Only the Socialist Party fielded candidates in the 1968 and 1973 elections.
Let Us Unite Senegal (JLS) was a coalition of three political parties - the National Democratic Rally (RND), And Jëf-African Party for Democracy and Socialism (AJ-PADS), and Convention for Democrats and Patriots-Garab Gi (CDP-Garab Gi).