 He was a member of the British Columbia New Democratic Party.He was removed from caucus on October 7, 2010, for public dissent regarding Carole James, former leader of the New Democratic Party of British Columbia, and subsequently sat in the legislature as an Independent MLA.On February 7, 2013, Simpson joined with Delta South MLA Vicki Huntington and Abbotsford South MLA John van Dongen to present a six-point agenda for democratic reform, including changes to B.C.