South Australia’s election result is being read inside both major parties as more than a one-off revolt. The headline numbers were already brutal enough: Labor was returned with 37.7 per cent of the primary vote and 32 seats, while One Nation surged to 22.1 per cent — ahead of the Liberals on 19.0 per cent, with the Liberals reduced to just four seats at the time of ABC’s latest count.

But beneath that collapse sat a more consequential shift. The strongest evidence from polling, demographic analysis and seat results suggests South Australia did not simply witness a “right-wing surge”.

It witnessed a political realignment in three directions at once: conservative Liberal voters moved right to One Nation, traditional working-class and tradie-heavy Labor areas swung heavily to One Nation as well, and more affluent or middle-class Liberal voters moved toward Peter Malinauskas’s Labor.

That helps explain what at first glance looks contradictory: Labor won a thumping parliamentary majority while still suffering substantial swings against it in parts of its own blue-collar base. In several working-class and outer suburban Labor electorates, the swing away from Labor was striking — 18.1 per cent in Light, 14.8 per cent in Elizabeth, 12.3 per cent in Taylor, 7.1 per cent in Port Adelaide and 6.3 per cent in Ramsay. Labor held those seats, but the movement was real and large.

That pattern lines up with pre-election and post-election analysis, indicating One Nation was eating into Labor’s traditional working-class territory, especially in lower-income, outer-suburban and less highly educated areas.

An Advertiser/YouGov poll reported before election day found Labor still led among traditional working-class voters, but One Nation had climbed to 29 per cent against Labor’s 35 per cent, an extraordinary figure for a party once seen as peripheral in SA. The same poll said One Nation was strongest among lower-income households, while Labor’s voter base increasingly included people identifying as middle class.

A separate analysis reported by The Australian found the strongest statistical predictors of a swing to One Nation were low incomes, low postgraduate education rates and a high share of labourers in an electorate. It said One Nation’s gains were strongest in outer regional seats but also substantial in outer Adelaide and old industrial suburbs, naming Light, Elizabeth and Port Adelaide as places where Labor lost ground while One Nation broke through.

That matters because it suggests the old Labor bargain with blue-collar South Australia is under real pressure. One Nation did not just take votes from the Coalition in country seats. It also found traction among the sort of economically squeezed, culturally disillusioned voters who once formed the heart of Labor’s industrial base. In Elizabeth, for example, reporting cited by The Australian said One Nation reached nearly a third of the vote, while the Liberal vote there almost disappeared.

At the same time, Labor was cleaning up in places that traditionally formed the Liberals’ metropolitan, professional and middle-class backbone. ABC’s electorate results show Labor gains from the Liberals in Hartley with an 8.4 per cent swing, Unley with 10.1 per cent, Morialta with 10.8 per cent and Colton with 14.9 per cent. Labor also recorded a huge 18.6 per cent swing in Black and held or strengthened in seats such as Dunstan, Adelaide and Gibson.

That pattern supports another key conclusion: the middle-class anti-Labor vote did not simply stay home or drift right. A significant slice appears to have moved to Labor as the Liberals lost authority in the centre. Again, the Advertiser/YouGov poll is instructive: among financially successful middle-class voters, Labor was on 41 per cent, the Liberals on just 22 per cent, and One Nation on 15 per cent. In other words, as the Liberals bled support on their right flank, they were also losing the centre ground to Malinauskas.

That is why the South Australian result was so damaging for the Liberals. They were squeezed from both sides. On the right, One Nation was eating into the culturally conservative and anti-establishment vote. In the centre, Labor was presenting as the safer, more competent option for middle-income and middle-class suburban voters.

The Guardian’s pre-election analysis noted that One Nation had “mostly picked up support from the Liberals”, but also cautioned that Labor’s vote had slipped from its earlier highs and that the Liberals’ collapse could allow One Nation to emerge as the main right-wing vehicle in some seats.

The final result confirmed the broader warning. One Nation did not merely post a protest vote; it overtook the Liberals statewide and won or led in a string of country and outer suburban seats. At the same time, Labor converted a wave of Liberal-held or Liberal-leaning middle-suburban seats, helping it wall off metropolitan Adelaide even as parts of its old working-class base frayed.

The political message is stark. In the contest for centre-right respectability, the Liberals lost centrist voters to Labor. In the contest for anger, grievance and anti-establishment energy, they lost right-wing voters to One Nation. And in parts of outer Adelaide and industrial South Australia, Labor no longer has a monopoly on the tradie and working-class vote that once defined it.

There is still a note of caution. Australia does not publish neat voter migration tables on election night, and some of this interpretation relies on demographic polling, seat swings and aggregate vote patterns rather than direct individual-level vote tracking. But taken together, the available evidence points in one direction: South Australia was not just a bad election for the Liberals. It was a warning that the old class and party alignments are breaking down, with Labor increasingly dominant among the centre and middle class, and One Nation increasingly competitive among the angry, economically strained and culturally alienated voters who once belonged to both major parties.

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