 He was originally elected to the Legislative Assembly in the 1995 general election as a Liberal member.He left the party to join the NDP in 1998, recontesting his seat in a by-election in which he attained 93.64 per cent of the vote, the second highest margin of victory ever attained by an electoral candidate in the province.Belanger has been re-elected in every election since then, most recently in the 2016 general election, in which he was re-elected with a majority of 1,109.