Longueuil—Saint-Hubert — Election Outlook & Projection
Where this riding stands
The RidingWatch model currently projects the Liberals at 46% in Longueuil—Saint-Hubert, 7 points ahead of the Bloc Québécois at 39%, with the NDP at 7%, the Conservatives at 6%, the Greens at 2%. Across 10,000 simulations the seat goes to the Liberals in 93% of them, the Bloc Québécois in 7%. The simulations put the Liberals' share anywhere from 40% to 53%, and the Bloc Québécois’ from 33% to 44%.
In April 2025 the Liberals won here with 41%, 1 points ahead of the Bloc Québécois. That was a change from 2021, when the Bloc Québécois took the seat. Compared with the 2025 result, the current projection has the Conservatives down 8, the Liberals up 5, the NDP up 2 points. These shifts come from the national polling swing applied to this riding's past results — not from riding-level polling, which the model does not have.
The sitting member is Natilien Joseph (Liberal), MP since 2025.
Rating: Likely Liberal — the Liberals are ahead in most simulations. In practical terms, the Liberals are ahead in most simulations, but the Bloc Québécois win in 7% of them — the outcome is probable, not fixed. Within 10 points of the lead: the Bloc Québécois (39%). Every vote counts toward a party's national total regardless of the local outcome. The Strategic Voting Assistant below shows how these standings look for a specific goal, including simply voting for your first choice.
Sitting member
About this riding
Located on the South Shore east of Longueuil, this riding encompasses Saint-Hubert and surrounding areas within the greater Longueuil metropolitan zone. Saint-Hubert developed as a residential suburb with modern planning featuring neighbourhoods, commercial corridors, and services. The area maintains suburban character with schools, parks, and retail facilities. Access to major transportation corridors facilitates commuting to Montreal employment centres. The riding represents the established suburban expansion pattern of South Shore Montreal region.
Projected Vote Share — Next Federal Election
Projected using a blended proportional-uniform swing model with incumbency adjustments. Based on the current national polling average and regional crosstabs as of 2026-09-14.
Vote-share trend
2021 and 2025 are official results for this riding; the third point is the current model projection. No estimated historical points are shown.
2025 Election Results vs. Current Projection
| Party | 2025 Vote % | Projected % | Change |
|---|---|---|---|
| Liberal | 41% | 46% | +5 |
| Conservative | 14% | 6% | -8 |
| NDP | 5% | 7% | +2 |
| Bloc Québécois | 40% | 39% | -1 |
| Green | 0% | 2% | +2 |
Strategic Voting Assistant
Reasoning uses the current projected shares for this riding. Viability = within 10 points of the leader or at least 15%.
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About the Model
This projection is generated by the RidingWatch statistical model, which combines national polling data with historical election results to estimate vote shares and likely outcomes in each of Canada's 343 federal ridings.
The model begins with a weighted blend of results from the 2025 and 2021 federal elections, then applies the polling swing to each riding using a mostly-uniform (90/10 uniform/proportional) swing method — the national swing, adjusted by the province's pooled deviation where pollsters publish regional crosstabs. No pollster house effects are applied. Incumbency is not assumed: only first-term MPs (+1) and party leaders (+2) receive an adjustment. Uncertainty is estimated through 10,000 Monte Carlo simulations with correlated regional errors.
Projections are updated as new polling data becomes available. All estimates are probabilistic — they represent the most likely outcome given current information, not a guarantee of any result. Actual election outcomes depend on factors the model cannot fully capture, including local campaigns, turnout variation, and late-breaking events.