In a party room ballot on Saturday morning, South Australian Liberals chose Alex Antic — a senator whose patient, branch-level organising over five years reflects a broader global pattern of populist movements reshaping centre-right parties from within. His victory over establishment candidate Nicola Centofanti signals that the tension between moderation and insurgency, long simmering in liberal democracies, has now reached one of Australia's oldest political institutions. The outcome raises a question familiar to many Western democracies: whether a mainstream conservative party can contain a