While the biggest upset of the 2025 Canadian General Election was Leader of the Opposition Pierre Poilievre losing his redistributed Carleton riding, this wasn't the first time he nearly lost it, barely beating back first time candidate Chris Rodgers in the 2015 Trudeau win.
Beating back a conventional liberal party candidate in the closest election of his career, Poilievre would go on to win by, 8.2% in 2019, and by comfortable—but not his largest—margin, 15.6% over environmentalist Gustave Roy in 2021.
Note: among the factors that made Poilievre's loss surprising was that the nominal results for the 2025 version of his Carleton Riding was the fact that conservatives won the riding by a combined 20.0% over the liberal party of canada.