[1] During the 1990s, he was a job developer for the Association for Persons with Physical Disabilities and a program coordinator for the Multicultural Council of Windsor and Essex County.

[3] In May 2001, the Windsor City Council unanimously approved Masse's motion to prevent school boards from selling vacant property lots at the highest market value.

Masse won the NDP nomination without opposition and defeated Liberal candidate Richard Pollock by 2,477 votes to win the seat.

[10] Masse served as the NDP critic for Auto Policy, Canada Border Services, and Customs in the 38th Canadian Parliament.

[12] During his first campaign for the House of Commons, the Windsor Star ran an editorial opposing him as "a bench-warmer, a yes-man, a political careerist".

[13] Two years later, however, a Star columnist wrote that Masse had "vastly exceeded expectations and quickly developed into an able, hard-working representative who has stayed on top of riding issues.

After the election, Masse and Comartin spoke out against the provincial NDP's decision to remove Canadian Auto Workers leader Buzz Hargrove from the party.