Three terms and a decisive majority under Stephen Harper. Erin O'Toole's leadership run — and subsequent castigation. Pierre Poilievre's meteoric ascendency to within striking distance of the country's top office.

What do these things all have in common? Jenni Byrne, the longtime Conservative powerbroker running Poilievre's campaign, who has moved in the party's inner circles since first joining the Reform Party at age 16.

Simon Lewsen recently profiled Byrne for Maclean's. He takes us through her biggest wins, her most crushing losses, and why her unwavering commitment to populist conservative principles has been her greatest strength — but may now have become one of the campaign's biggest liabilities.

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