The Political RecordFederal electoral districtsNo. 35090Ontario

Sarnia—Lambton—Bkejwanong

Sarnia—Lambton—Bkejwanong is a federal riding in Ontario. Marilyn Gladu (first elected to the House in 2015) represents Sarnia—Lambton—Bkejwanong. Marilyn Gladu was elected a Conservative and has sat as a Liberal since 2026-04-08. Marilyn Gladu (Conservative) held Sarnia—Lambton—Bkejwanong for the Conservatives in the 2025 election by 11,657 votes (15.2 points), with 53.1% of the vote. George Vandenberg (Liberal) was second with 37.9%, on a turnout of 71.7% of 107,133 electors. Member as of 2026-11-01.

Fig. 1 — Sarnia—Lambton—Bkejwanong on the board, 2023 boundaries; the ridings next door as the House holds them on 2026-11-01. Open it on the board →

Who represents Sarnia—Lambton—Bkejwanong

Marilyn Gladu's piece from the board. Illustration after the official portrait © House of Commons.

Marilyn Gladu

Member of Parliament for Sarnia—Lambton—Bkejwanong

Liberal since 2026-04-08 · elected in 2025 as a Conservative

MP since 2015-10-19 · 4 terms

Justice and Human Rights committee
Status of Women committee
Vice-Chair, Status of Women committee

208 speeches in the 45th Parliament, most often on Budget 2025 Implementation Act, No. 1.

Contact and office · House of Commons →

The 2025 result: Conservative hold

Share of the valid votes by candidate, Sarnia—Lambton—Bkejwanong, April 28, 2025

Shares of the 76,389 valid votes; a candidate under 1% is counted with the others. Source: Elections Canada, official voting results, the 2025 general election.

The figures

Candidate	Party	Votes	Share
Marilyn Gladu	Conservative	40,597	53.1%
George Vandenberg	Liberal	28,940	37.9%
Lo-Anne Chan	New Democratic	4,088	5.4%
Brian Everaert	People's Party	1,136	1.5%
Jacques Y Boudreau	Libertarian	990	1.3%
Others (2)		638	0.8%

Marilyn Gladu (Conservative) won Sarnia—Lambton—Bkejwanong on April 28, 2025 with 40,597 votes, 53.1% of the 76,389 valid votes. George Vandenberg (Liberal) was second with 28,940 (37.9%), 11,657 votes and 15.2 points behind.

Of the 76,389 valid votes, Marilyn Gladu (Conservative) took 53.1%, George Vandenberg (Liberal) 37.9%, Lo-Anne Chan (New Democratic) 5.4%, Brian Everaert (People's Party) 1.5% and Jacques Y Boudreau (Libertarian) 1.3%; the 2 other candidates took 0.8% together. Turnout was 71.7% of 107,133 electors: 76,766 ballots cast, 76,389 of them valid, for 7 candidates.

Since 2021

Against the 2021 result on these boundaries, the Conservatives are up 6.9 (46.2% to 53.1%), the Liberals up 18.6 (19.3% to 37.9%), the New Democrats down 15.5 (20.9% to 5.4%), the People's Party down 9.4 (10.9% to 1.5%) and the others up 1.6 (0.6% to 1.3%), in points of the valid votes.

2021 is Elections Canada's transposition of that election onto the 2023 boundaries, not an election held on these lines.

Since 2004: usually Conservative

The party first in Sarnia—Lambton—Bkejwanong at each general election, 2004 to 2025, on today's boundaries

2004Liberal41.6%by 9.7 points over the Conservatives
2006changed handsConservative41.8%by 9.1 points over the Liberals
2008Conservative50.2%by 29.2 points over the Liberals
2011Conservative53.4%by 24.4 points over the New Democrats
2015Conservative40.9%by 12.4 points over the New Democrats
2019Conservative49.3%by 27.7 points over the Liberals
2021Conservative46.2%by 25.4 points over the New Democrats
2025Conservative53.1%by 15.2 points over the Liberals

Each election carried onto today's boundaries by where the riding's 2025 electors lived: our estimate to 2019, Elections Canada's transposition for 2021, the official result for 2025. Parties are counted as they ran.

The figures

Year	First	Share	Second	Margin (pts)	Basis
2004	Liberal	41.6%	Conservative	9.7	carried, our estimate
2006	Conservative	41.8%	Liberal	9.1	carried, our estimate
2008	Conservative	50.2%	Liberal	29.2	carried, our estimate
2011	Conservative	53.4%	New Democratic	24.4	carried, our estimate
2015	Conservative	40.9%	New Democratic	12.4	carried, our estimate
2019	Conservative	49.3%	Liberal	27.7	carried, our estimate
2021	Conservative	46.2%	New Democratic	25.4	transposed by Elections Canada
2025	Conservative	53.1%	Liberal	15.2	official result

The Conservatives were first here at seven of the eight general elections from 2004 to 2025; the Liberals were first in 2004. In 2025 the Conservatives took 53.1% of the vote here, 8.3 points above their average of 44.8% at the seven general elections from 2004 to 2021.

On today's boundaries the Liberals were first here in 2004 (41.6%) and the Conservatives in 2006 (41.8%), 2008 (50.2%), 2011 (53.4%), 2015 (40.9%), 2019 (49.3%), 2021 (46.2%) and 2025 (53.1%), each with the share of the valid votes shown.

A stronghold is a party first at every general election since 2004, by an average of 20 points or more over the next party; held, first at every one; usually, first at all but one. By-elections are not counted. By this rule 83 of the 343 ridings are usually one party's. The results before 2021 are carried onto today's boundaries by where the riding's 2025 electors lived: our estimate, from the older boundaries of Taylor, Lucas, Kirby and Hewitt and the results in Sevi's "Who Runs?". 2021 is Elections Canada's transposition, and 2025 the official result.

Before 2025

2021 Conservative · Marilyn Gladu, by 14,302 votes (25.1 pts)
2019 Conservative · Marilyn Gladu, by 15,979 votes (27.6 pts)
2015 Conservative · Marilyn Gladu, by 4,463 votes (7.7 pts)

In Sarnia—Lambton on the 2013 boundaries, the riding most of the 2025 electors in today's Sarnia—Lambton—Bkejwanong lived in; Elections Canada's official results.

What kind of place Sarnia—Lambton—Bkejwanong is

Population: 128,1552021 census
Area: 4,173km²
Density: 31people per km²
Electors: 107,133on the 2025 lists

Median age is 46.4 — a little higher than the median riding's 41.6.
highestlowest59th highest of 343
Share aged 25-64 with a bachelor's degree or higher is 18.8% — about 67 percent of the median riding's 28.2%.
highestlowest78th lowest of 343
Share who are immigrants is 9.7% — about 56 percent of the median riding's 17.3%.
highestlowest111th lowest of 343
Share of households that own their home is 74.4% — a little higher than the median riding's 71.4%.
highestlowest126th highest of 343
Share with French as a mother tongue is 1.6% — about the same as the median riding's 1.6%.
highestlowest165th highest of 343
Median total household income is $83,000 — about the same as the median riding's $84,000.
highestlowest171st lowest of 343

2021 Census on the 2023 boundaries; each rule places this riding among all 343. Density is the census population over the riding's area.

IDid this riding change?

Yes. 82% of the 2025 electors in today's Sarnia—Lambton—Bkejwanong lived in the old Sarnia—Lambton; by area, 56% of the riding came from the old Lambton—Kent—Middlesex.

Share of today's electorsFormer riding

81.7%Sarnia—Lambton 44.2% of the area

18.3%Lambton—Kent—Middlesex 55.8% of the area · 39% of it kept

How this is measured. Electors: the share of the current riding's 2025 ordinary-list electors who lived in each former riding, each 2025 polling division placed in the 2013 riding a point inside it falls in. Area: the share of the current riding's area that came from each former riding, by intersecting the 2013 and 2023 boundary files, and how much of the former riding that part was. Area is land, not population. Elections Canada counts 48 of 343 ridings as entirely unchanged.

IIThe 2025 result

Candidate	Party	Votes	%	2021	±
Marilyn Gladu	Conservative	40,597	53.1%	46.2%	+6.9
George Vandenberg	Liberal	28,940	37.9%	19.3%	+18.6
Lo-Anne Chan	New Democratic	4,088	5.4%	20.9%	−15.5
Brian Everaert	People's	1,136	1.5%	10.9%	−9.4
Jacques Y Boudreau	Other	990	1.3%	0.6%	+1.6

2 further candidates, each under 1% of the vote

Mark Lamore	Other	437	0.6%
Tony Mitchell	Other	201	0.3%

The 2021 column is Elections Canada's official transposition of the 2021 result onto these 2023 boundaries. ± is the change in each party's share. It is not "swing": with four or more competitive parties there is no single pair to swing between.

IIIHow close was it, really

Third place vs. the margin

4,088 votes

New Democratic took fewer than the 11,657-vote margin.

Election-day polls won by others

35 of 231

2 polls ended in an exact tie.

Fig. 2 — Each square is one election-day poll: ■ won by the Conservatives (194) · ■ won by another party (35) · ▨ tied (2).

Flip the seatHypothetical

It would have taken 5,829 voters switching from Conservative to Liberal — 7.6% of the 76,389 valid votes, 7.6 points — to change the result. No ballot was cast this way; this only moves votes between the top two.

Voters who switch: 0011,658

Conservative40,597

Liberal28,940

Still Conservative by 11,657 votes. Actual margin: 11,657.

IVElection day versus advance

Only 60.2% of this riding's votes were cast at election-day polls. The rest were advance or special ballots.

On election day the Conservatives took 55.6%, the Liberals 34.3%, the New Democrats 6.0%, the others 2.4% and the People's Party 1.8%; in advance and special ballots, 49.5%, 43.3%, 4.4%, 1.7% and 1.1%, in that order.

Share of the valid votes by party, election-day polls against advance and special ballots, Sarnia—Lambton—Bkejwanong, April 28, 2025

Shares of the valid votes cast at election-day polls, and of those cast at advance polls, at mobile polls and by special ballot; the gap is the second less the first, in points. Source: Elections Canada, poll-by-poll results, the 2025 general election.

The figures

Party	Election day	Advance and special	Gap
Conservative	55.6%	49.5%	−6.1
Liberal	34.3%	43.3%	+9.0
New Democratic	6.0%	4.4%	−1.6
Other	2.4%	1.7%	−0.7
People's Party	1.8%	1.1%	−0.7

An association, not a cause. Voters who cast ballots before election day differed from those who turned out on the day. It does not say why. There is no poll-level turnout figure on this page: the elector count on a polling division includes people who voted in advance and were counted elsewhere.

VWhere it is

loading basemap…

Fig. 3 — Sarnia—Lambton—Bkejwanong and its 5 neighbouring ridings.

Sources and citation

"Sarnia—Lambton—Bkejwanong — federal riding profile and 2025 results."
The Political Record. https://politicalrecord.ca/riding/sarnia-lambton-bkejwanong/
Accessed 2026-11-10.

Results and transposition: Elections Canada. Boundaries: Elections Canada / Statistics Canada, Open Government Licence – Canada. Census: Statistics Canada 2021 Census. Member: House of Commons.

Figures reconcile to the certified national total of 19,641,663 votes. The member is as the House of Commons listed them on 2026-11-01. Page built 2026-11-10.