South Australia goes to the polls on 21 March, and the arithmetic could scarcely look worse for the state's centre-right forces. A special Roy Morgan survey of 2,172 South Australian electors, conducted between 19 and 23 February 2026, has Premier Peter Malinauskas's Labor government tracking toward what would be the largest election victory by any party in the state this century.
The strategic calculus here involves several competing considerations. On the primary vote, Roy Morgan has Labor on 35%, One Nation on 28%, the Liberals on just 16.5%, and the Greens on 11%. On a two-party preferred basis, Labor leads the Liberals 61% to 39%, a swing of more than six percentage points since the 2022 state election. Labor also holds a commanding 59-41 lead over One Nation on the same measure.
What often goes unmentioned in the headline figures is the sheer depth of Malinauskas's personal standing. A clear majority of 61% of South Australian electors approve of his performance as Premier, and he is preferred as the better Premier over Liberal leader Ashton Hurn by 61% to 30.5%. That approval extends across both genders, all four key age groups, and voters in both Adelaide and country South Australia, according to the Roy Morgan data. This breadth of support is, by any reasonable historical standard, unusual for a government approaching the end of its first term.
The more consequential story, from a structural perspective, is what is happening on the right. The Liberal Party's primary vote of 16.5% represents a fall of nearly 20 percentage points since the 2022 election, according to Roy Morgan's own comparison figures. One Nation, which recorded negligible lower-house support in SA just a few years ago, has grown its primary vote by more than 25 percentage points over the same period. As The Conversation has reported, One Nation now leads the Liberals on the primary vote, and the party is fielding candidates in all 47 lower house seats. Some analysts believe the Liberals could be reduced to as few as three lower house seats if current polling is replicated on election day.
The Liberal Party's difficulties are not purely electoral. As has been widely reported, the party has endured prolonged factional conflict between its moderate and conservative wings, a series of parliamentary resignations, and the loss of two by-elections to Labor under successive leaders. The most recent leader before Ashton Hurn, David Speirs, resigned his seat after a drug offence matter. Hurn, who assumed the leadership in December 2025 with barely 100 days before polling day, inherited what one observer described as a party facing a "perfect storm" of cumulative crises.
One Nation has sought to capitalise on this fragmentation by recruiting former Liberal senator Cory Bernardi to lead its upper house ticket. Bernardi, who held a South Australian Senate seat from 2006 to 2017 before leaving to form the since-dissolved Australian Conservatives, brings name recognition and a firmly conservative profile to the campaign. Whether his presence translates into lower house gains or merely upper house representation remains an open question; most analysts expect him to secure a Legislative Council seat, with state party president Carlos Quaremba also a possibility.
Three factors merit particular attention for those watching this election as a national bellwether. First, the fragmentation of the centre-right vote in South Australia mirrors trends in comparable democracies, where established centre-right parties have struggled to hold their coalitions together against the gravitational pull of more assertive populist movements. Second, the preference flows between One Nation and the Liberals will be closely scrutinised. The Roy Morgan data suggests that in rural and regional contests, the gap between One Nation and the Liberals on a two-party preferred basis narrows significantly to 52.5-47.5, meaning individual seat results in country SA could be unpredictable. Third, the question of what constitutes an effective parliamentary opposition if the Liberals are reduced to a rump remains genuinely unresolved.
What is often overlooked in the public discourse is that Labor's dominance in this poll is not simply a story of policy success. The Malinauskas government has faced real scrutiny over ambulance ramping, energy costs, and housing affordability. The evidence, though incomplete, suggests that voter comfort with Malinauskas himself is doing much of the heavy lifting, rather than satisfaction with each individual policy area. A government that wins by this margin despite ongoing service delivery debates has effectively been gifted an opposition in disarray.
From a centre-right perspective, the structural problem is acute. A fragmented conservative vote that splits between the Liberals and One Nation produces, paradoxically, a more durable Labor majority. Voters who are genuinely dissatisfied with Labor's management of hospital services or cost-of-living pressures may find their protest vote absorbed into One Nation's primary tally without translating into effective parliamentary accountability. The historical record from other states suggests that populist insurgencies of this type tend to be more durable in upper houses, where proportional representation rewards minority support, than in single-member lower house contests.
The March 21 result will not, in isolation, determine the long-term trajectory of South Australian or national politics. What it can do is clarify whether One Nation's surge represents a durable realignment of the conservative electorate or a temporary expression of frustration with an under-resourced Liberal opposition. Either way, the question of how a modern centre-right party rebuilds credibility, policy coherence, and voter trust is one that deserves serious analytical attention well beyond election night. Reasonable people across the political spectrum can agree on at least this much: a functioning, accountable opposition is not a partisan luxury. It is a democratic necessity, and the integrity of the electoral system depends on voters having genuine choices between credible alternatives.