Labor has comfortably won re-election in South Australia in a result described as "an earthquake" that would have implications all around the country, while One Nation appears to have achieved its best electoral result anywhere in the country in nearly 30 years.
Labor captured nearly 38 per cent of the primary vote, comfortably ahead of One Nation's 21 per cent and the Liberals' dismal 19 per cent. This marks the first time the Liberal Party have finished outside the top two highest parties by vote share at a South Australian election, and One Nation's best performance in any state or federal election since the 1998 Queensland state election.
The scale of One Nation's breakthrough cannot be overstated for those watching Australian politics. Historically, the party has had limited presence in South Australia, often returning a primary vote of about 4 per cent. A jump to 21.6 per cent represents a fundamental shift in how South Australian voters are distributing their political support.
The Liberal Collapse
The Liberal leadership churn has undermined the party's standing, with four leaders in four years, and the party has faced a number of scandals across a range of seats including Mount Gambier, Narrungga, MacKillop and Black. More telling is that the party is no longer able to retain MPs; former MPs such as Dan Cregan (Kavel) and Jing Lee (MLC) left to become independents, symptomatic of a party where its members feel increasingly unwelcome.
One Nation has taken advantage of the ideological and factional instability of the Liberal Party, with conservative efforts to control the party undermining unity and discipline. This dysfunction left space for a challenger to emerge. The Liberals did not simply lose ground to Labor; they were overtaken on their ideological flank.
What Drove the Surge?
On polling data, the One Nation surge began at the start of 2026, in the wake of the December 2025 Bondi terrorist attack. Support is strongest outside Adelaide, where One Nation leads with 27 per cent, ahead of Labor at 24 per cent and the Liberals at 21 per cent, with the contest becoming highly competitive in these regions.
The surge centred on bread-and-butter concerns. The result delivered Malinauskas a commanding mandate after a campaign dominated by cost-of-living pressures, housing affordability and immigration debates. One Nation positioned itself as the anti-establishment alternative, and in regional South Australia, that message found an audience.
Temporary Spike or Structural Realignment?
The question consuming political observers is whether this represents genuine realignment or a temporary protest vote. There might be a temptation to see this as a one-off sugar hit for One Nation, yet this result has been coming for quite some time, with the implosion of the SA Liberals not a sudden phenomenon.
For the major parties, the challenge is clear: winning back these voters will require better representation, not simply adopting One Nation's policies; in regional seats, contests are shaping into highly competitive multi-candidate races where outcomes will depend heavily on preference flows.
More pressingly, One Nation sees this as a springboard for the Victorian state election and the federal Farrer byelection. In Victoria, One Nation's primary vote is reaching 21 per cent in recent polling, behind Labor on 23 per cent and the Coalition on 29 per cent.
The Strategic Dilemma for Conservatives
State leader Ashton Hurn and federal leader Angus Taylor face an ideological and strategic dilemma: conservatives will push the leaders to adopt One-Nation-lite policies to win back regional and former safe seats, yet moderates will argue that since the party is no longer in any meaningful sense a party of the city, it needs to radically overhaul its offerings to win back inner-city and more affluent suburban seats.
There is no obvious path forward for the Liberals. Party leaders may well invoke the ghost of Robert Menzies or the formula of John Howard, but neither of these premierships offer much to a shrunken Liberal Party in a far more fluid and fragmented Australian polity.
The South Australian result crystallises a broader challenge for centre-right politics in Australia. Voter frustration is real and measurable. Whether One Nation can sustain its momentum beyond the next election cycle, however, remains an open question. What is beyond doubt is that the political landscape has shifted, and the Liberals now must rebuild from a position of genuine weakness.