One Nation wins Secret Harbour by-election in Western Australia

One Nation secured a significant victory in the Secret Harbour by-election in Western Australia, capturing 38.9% of the primary vote and 57% of the two-party preferred vote. This result represents a major swing for the party, which saw its support rise from 8.43% in the March 2025 state election. In contrast, the Labor Party experienced a sharp decline, with its primary vote dropping from 46.5% to 24.3%.

The win is viewed as a protest against establishment politics, driven by voter dissatisfaction with cost-of-living pressures, including unaffordable housing, high rents, and stagnant wages. Analysts suggest the result signals a growing populist momentum that is no longer confined to the Coalition side of politics, as One Nation has now successfully claimed a seat from Labor in Western Australia.

While One Nation holds only one seat in the 59-seat Western Australian parliament, the victory follows similar shifts in South Australia, suggesting that changing voter sentiment may impact future state and federal elections.