The Battle for Terrebonne: One Vote, One Seat, and a Path to a Majority

By Katie Williams

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The Battle for Terrebonne: One Vote, One Seat, and a Path to a Majority

While three federal byelections are scheduled for Monday, April 13, all eyes are on the Quebec riding of Terrebonne. What was once a routine seat has become a national flashpoint that could reshape the power dynamic in Ottawa.

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The Rematch of the Century

This isn’t just another election; it is a court-ordered “do-over.” In the 2025 general election, Liberal Tatiana Auguste defeated the Bloc Québécois incumbent Nathalie Sinclair-Desgagné by a razor-thin margin of just one vote.

The result was overturned by the Supreme Court in February 2026 after a printing error on a mail-in ballot envelope was found to have potentially disenfranchised at least one voter. Now, both candidates are back on the trail for a high-stakes rematch.

The Majority Math

For Prime Minister Mark Carney’s Liberal government, Terrebonne is the final piece of the puzzle. The Liberals currently sit just shy of a working majority:

  • The Magic Number: 172 seats are required for a majority.
  • The Strategy: With two “safe” Liberal seats up for grabs in Toronto (Scarborough Southwest and University–Rosedale), a win in Terrebonne would push the party to the 172-seat threshold.
  • The Speaker Factor: Because the House Speaker is a Liberal and only votes to break ties, the party is pushing for a “true” majority to ensure they can pass legislation without procedural headaches.

Campaign Blitz in Montreal

The timing couldn’t be better for the Liberals. The party’s national convention is taking place in Montreal this weekend, allowing a massive surge of volunteers and cabinet ministers to flood the neighboring Terrebonne riding for a final get-out-the-vote push.

“The vibe is very different from 2024,” noted one party organizer, referencing the Liberal loss in LaSalle–Émard–Verdun two years ago. “This time, we aren’t just playing defense; we are fighting to win.”

Voter Challenges: The “Longest Ballot”

Residents in Terrebonne won’t just be choosing between the big parties. They will be handed a massive ballot featuring 48 candidates. This is part of a continued protest by the “Longest Ballot Committee,” a group aimed at highlighting the perceived flaws of Canada’s first-past-the-post voting system.

Despite the crowded ballot, local interest is surging. Advance polls have already seen a 20% turnout, indicating that voters in Terrebonne are well aware that—this time—every single vote truly does count.