The Parti Québécois sailed to a third-straight Quebec byelection win on Monday, cementing the sovereigntist party's momentum ahead of the 2026 provincial election and dealing a crushing blow to Premier François Legault's governing party.

Former journalist Alex Boissonneault handily defeated Quebec Conservative Leader Éric Duhaime in the Arthabaska riding, flipping a seat that Legault's Coalition Avenir Quebec has held since 2012.

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