Candidate dossier / 031 · Côte-du-Sud

Where

Riding 799 · Chaudière-Appalaches / Bas-Saint-LaurentCôte-du-SudMontmagny and 44 other communities

The challenger

QLPQuebec Liberal Party

Nancy St-Pierre

Côte-du-Sud

41.4points behind the leader

CAQCoalition avenir Québec

INCUMBENT

Mathieu RivestCôte-du-Sud

47.7 %

Mathieu RivestCoalition avenir Québec · IncumbentCAQ since 2018

The climb · 2022

CAQMathieu Rivest

PQValérie Hamel

QLPNancy St-Pierre

Gap at the last election41.4 points

Unchanged territory according to the official final 2026 list. The 2022 and 2018 histories use the 2017 map; name changes are verified. Party hold is established at August 27, 2026, independently of confirmed nominations. Age and tenure are not documented.

The candidate’s own words

Why I’m running

There is room here for Nancy St-Pierre to explain their commitment, priorities and what the numbers cannot tell us.

No response has been published yet. This does not indicate a refusal or a lack of effort.

The questions we want to ask

Why are you running in this riding?
What should people know about you beyond your age or the difficult assignment?
What local issue do you want to bring to the National Assembly?
What would a successful campaign look like to you, even without winning?
What support are you receiving from your party and your team?
What do you hope to continue after election day?

A gap measured at the last election, not a prediction.

At dissolution on August 27, 2026 : Mathieu Rivest · CAQ. This affiliation is separate from confirmation of a new nomination.

The arithmetic behind the assignment

H1 · 2022 · Côte-du-Sud

Party at the previous election : 6.3 %

Strongest opponent at that election : 47.7 %

33,792 valid votes · Verified comparable territory

Inspect all votes and the denominator

Mathieu Rivest · CAQ16,116 votes
Frédéric Poulin · PCQ7,910 votes
Michel Forget · PQ4,316 votes
Guillaume Dufour · QS3,154 votes
Sylvain Lemieux · QLP2,132 votes
Sylvain Cloutier · ÉA164 votes

Sum of candidate votes = 33,792 / 33,792 valid votes

H2 · 2018 · Côte-du-Sud

Party at the previous election : 22.0 %

Strongest opponent at that election : 53.6 %

32,799 valid votes · Verified comparable territory

Shown for context. The score uses the last election only.

Inspect all votes and the denominator

Marie-Eve Proulx · CAQ17,595 votes
Simon Laboissonnière · QLP7,212 votes
Guillaume Dufour · QS3,560 votes
Michel Forget · PQ3,315 votes
Marc Roussin · PCQ575 votes
Renaud Blais · PN304 votes
Gabriel Dubé · BP238 votes

Sum of candidate votes = 32,799 / 32,799 valid votes

The calculation

47.7 % − 6.3 % = 41.4 points

Calculated using unrounded values; displayed to one decimal.

Sources and supporting evidence (9)

Élections Québec ↗Official file retained with SHA-256 checksum and schema validation.September 7, 2026 · SHA-256 969675c27b6f594d
Élections Québec ↗Official file retained with SHA-256 checksum and schema validation.September 6, 2026 · SHA-256 4515dbbc7d71aace
Élections Québec ↗Official file retained with SHA-256 checksum and schema validation.September 6, 2026 · SHA-256 ffe7e38098f0e071
Élections Québec ↗Official file retained with SHA-256 checksum and schema validation.September 6, 2026 · SHA-256 4030bbb26912a7bc
Élections Québec ↗Official map history: twelve territories retained in 2026; 2017 map used in 2018 and 2022.September 6, 2026 · SHA-256 6b23cd706bd2ca87
Élections Québec ↗Official file retained with SHA-256 checksum and schema validation.September 6, 2026 · SHA-256 dd164f0ad5ff7e9f
Assemblée nationale du Québec ↗Official file retained with SHA-256 checksum and schema validation.September 7, 2026 · SHA-256 1d8ee8ea2a30ef5d
Élections Québec ↗Official file retained with SHA-256 checksum and schema validation.September 6, 2026 · SHA-256 66a4410f46b2c664
Élections Québec ↗Official file retained with SHA-256 checksum and schema validation.September 6, 2026 · SHA-256 ff268ada6bee3c51