At the time of his election to the House of Commons, he was a McGill University student completing his Bachelor of Arts degree majoring in political science with a minor in history.

[3] Dubé defeated incumbent MP Yves Lessard of the Bloc Québécois by 15.1% or more than 10,000 votes in the 2011 election.

[1] He was one of five current McGill University students, alongside fellow undergraduates Mylène Freeman, Laurin Liu, and Charmaine Borg, and graduate student Jamie Nicholls, elected to Parliament in the 2011 election following the New Democratic Party's unexpected mid-campaign surge in Quebec.

[9] Subsequently, under Mulcair's successor Jagmeet Singh, Dubé went on to become the party’s Public Safety and Emergency Preparedness critic as well as the NDP caucus chair.

[10] He lost his seat to Yves-François Blanchet, leader of the Bloc Québécois, in the 2019 Canadian federal election.