The federal Liberals won all three byelections being held Monday night in Ontario and Quebec, giving Prime Minister Mark Carney a majority government.
The University-Rosedale byelection was called early in the night for Liberal Danielle Martin as was the Scarborough Southwest riding for Liberal Doly Begum.
However, it was a tighter race in Terrebonne. With 100 per cent of polls reporting, Elections Canada has Liberal Tatiana Auguste beating Bloc Québécois’ Nathalie Sinclair-Desgagné by 731 votes.
Martin gave the Liberals their 172 seat majority in the federal government and the win in Scarborough Southwest and Terrebonne gives them the numbers to effectively govern at 174.
“As of tonight, Mark Carney and our entire incredible Liberal team have earned an even more powerful mandate to continue building a better Canada. Now, this is not a mandate to be quiet. It is not a mandate to take our time. It is a mandate to get to work on housing, on affordability, on healthcare, and climate change, and infrastructure, on the future of our economy and the public services that are more
important to this country than ever,” Martin said in her speech to supporters.
The University-Rosedale seat opened up when Chrystia Freeland resigned in January to serve as an adviser to Ukraine and CEO of the Rhodes Trust at Oxford University.
Martin was up against Serena Purdy, health systems scholar and community organizer, for the NDP, business owner Don Hodgson for the Conservatives and Andrew Massey, a writer and editor, who was running for the Green Party.
With 100 per cent of polls report, Martin captured 64 per cent of the vote followed by Purdy with 18 per cent.
The Scarborough Southwest seat was up for grabs after Bill Blair resigned in February to take on the role of Canada’s high commissioner to the United Kingdom.
Belgum resigned as the deputy leader of the Ontario NDP and MPP for the Scarborough Southwest riding in order to run in the federal byelection.
“Tonight, we celebrate a new beginning. Over the last two months, hundreds of you from every corner of our beautiful riding and beyond, came together to knock on doors, make phone calls, and sometimes canvas in the freezing rain to connect with families and neighbors
across Scarborough Southwest,” said Begum in her victory speech. “To each and every single one of you, thank you.”
She had a commanding victory capturing nearly 70 per cent of the unofficial vote total.
Begum also told reporters she spoke with Carney shortly after her win. “He congratulated me and he said that he is looking forward to working with me and actually told me to go to caucus meetings this week so I’m excited for that.”
Middle school teacher Diana Filipova was running for the Conservatives in Scarborough.. Pooja Malhotra, a community organizer and medical copywriter represented the Green Party on the ballot while community leader Fatima Shaban was the NDP’s candidate.
Filipova finished second to Begum with over 18 per cent of the vote.
Early voting data from Elections Canada showed over 33.5 per cent of eligible voters cast a ballot in Scarborough Southwest and just over 32 per cent voted in University-Rosedale with just one poll left to report.
Terrebonne, Quebec held their byelection following an issue with a mail-in ballot last year.
Auguste was initially declared the winner last April, before the result flipped to Bloc Québécois’ Nathalie Sinclair-Desgagné after the votes went through a validation process. A judicial recount completed on May 10, 2025, however, concluded the Liberals received one more vote than Sinclair-Desgagné.
Five floor crossings, including four Conservatives, put the federal Liberals right at the edge of a majority before Monday night.
Marilyn Gladu, Chris d’Entremont, Michael Ma and Matt Jeneroux all left the Conservatives to join the Liberals between November 2025 and April 2026. Nunavut MP Lori Idlout left the NDP in March.