Terrebonne (provincial electoral district)

In the 1935 provincial election, the election of Athanase David was contested on the ground that the ballot papers were not printed in the form prescribed under the Election Act. At the subsequent hearing, the judge ruled that all cast ballots were thus void. Immediately afterwards, the returning officer announced that, as this resulted in a 0–0 tie, he cast his deciding vote in favour of David.^[3][4] The returning officer's action was considered to have been without precedent anywhere in the world in countries with parliamentary-style legislatures.^[5] The Conservatives lodged an appeal,^[5] but the result was upheld by the Quebec Court of Appeal in April 1936.^[6] David would become the only member of the Assembly in Quebec history to be elected on only one cast vote.^[7][8]

In the March 2025 provincial by-election, while the riding flipped from the CAQ back to the PQ after being held for two elections by Pierre Fitzgibbon, Québec solidaire was also squeezed out of third place by the PLQ, dropping in support by over eight percentage points (while the Liberals had lost two points). Nadia Poirier, a second-time QS nominee,^[9] complained afterwards about the lack of support she received from the party, noting that none of its 12 MNAs came out to help in her campaign and that the party had solidarity in name only.^[10] QS responded that, as Terrebonne had been a péquiste stronghold for 25 years, it allocated its resources based on a serious analysis of its chances of winning.^[9] In June 2025, Poirier announced that she was leaving QS to join the PQ.^[11]