One Nation is set to join South Australia's lower house after converting surging support in the polls into a historic foothold in the state election.
As Labor romped to a record victory, Pauline Hanson's party capitalised on anger against the establishment, achieving its best result anywhere in Australia for decades and decimating the Liberal party.
"It's the start of a new beginning for the people of South Australia and the people of Australia," the One Nation leader said.
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"This will send a clear message. I'm not going to stop at South Australia, I'm going to go to after the seat of Farrer [in an upcoming NSW byelection], and then Victoria."
In South Australia's lower house, the Labor Party will increase its majority to at least 32 and could gain as many as 35 seats.
The Liberals have only four with slim hope that they could hold another three.
One Nation's David Payton, the Adelaide Plains Council deputy mayor, won the seat of Ngadjuri, the party's first lower house seat won at an election outside of Queensland.
The party is on track for at least two seats in the lower house and at least another in the upper house, where SA One Nation leader Cory Bernardi is its lead candidate.
The votes are still being counted and the results won't be known for days in some elections.
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Labor's Peter Malinauskas landed the largest election victory in the state's history.
"We can and should wave our flag with pride knowing that Aussie patriotism sometimes means sitting with a stranger and sharing a cuppa or a frothy," he said.
While most of the state went to the polls supporting Labor, more than one in five South Australians backed One Nation, which overtook the Liberals as the second most popular in the state.
One Nation leads the Liberal Party in two-thirds of lower house seats and outside of Adelaide, they lead all parties in total vote, figures that will likely scare the major parties in other states and in Canberra.
"I think the lesson from that not just in South Australia but federally is that people are angry," former opposition leader David Littleproud said.
Former Nationals MP Barnaby Joyce, who joined One Nation in December after a fallout with the Coalition's junior partner, celebrated the party's first successful election test with a promise: this is only the beginning.
As the results became clear, the Liberals were baying for blood, not blaming current leader Ashton Hurn but demanding an apology from former leader David Speirs.
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He apologised during Nine's SA Election coverage for the effects his personal scandals have had on the Liberal Party.
The former state opposition leader was fined $9000 and handed 37.5 hours of community service after being convicted for supplying cocaine to two men.
