The Saint-Hyacinthe—Bagot—Acton federal by-election, scheduled for December 7, 2026, features a contest shaped by the riding’s consistent Bloc Québécois support in recent general elections and the candidates’ local profiles. Caroline Émond, the Bloc nominee with prior roles in Quebec’s international agricultural representation and dairy sector leadership, holds the strongest trader consensus at 63 percent, reflecting the party’s established base in this rural Quebec constituency east of Montreal. Chantal Soucy, the Liberal candidate and former Coalition Avenir Québec MNA with over a decade of provincial service in Saint-Hyacinthe, trails at 35.5 percent on the strength of her regional name recognition and community ties. Conservative Luc Brodeur-Jourdain and NDP candidate Mathieu Boisvert register minimal market pricing near 1–2 percent. The vacancy followed the resignation of former Bloc MP Simon-Pierre Savard-Tremblay, with limited recent polling or events altering the competitive positioning ahead of the vote.