He represented the electoral district of Chilliwack as a member of the British Columbia New Democratic Party caucus.

[1] He defeated the two-term incumbent John Martin; prior to the 2020 election, Chilliwack was considered a stronghold for the then-BC Liberal Party.

[4] In the 2024 British Columbia general election, Coulter was defeated in his bid for re-election by Conservative candidate Heather Maahs.

[5] He was appointed the interim Provincial Director of the British Columbia New Democratic Party after the resignation of Heather Stoutenburg.

After graduating from high school in 1993, he worked as a welder and then became a certified millwright with the Red Seal Program in 1999.

[13] In October 2017, fellow Chilliwack school trustee Barry Neufeld made a Facebook post in which he called supporting transgender children in their gender identity child abuse, cited the American College of Pediatricians (an anti-LGBTQ organization) and said that he belonged "in a country like Russia, or Paraguay, which recently had the guts to stand up to these radical cultural nihilists.