'Yes' campaigners for an Indigenous voice see the crucial state of South Australia as winnable in the upcoming referendum.
Prime Minister Anthony Albanese will announce the date of the referendum in Adelaide on Wednesday, with the national vote expected to be set for October 14.
Mr Albanese says a 'yes' vote would allow Australians "to feel better about ourselves (by) the fact that we can acknowledge the fullness and richness of our history".
"But it will also say to the world that we are a mature nation ... and that's important in terms of the relationship building," he told a business breakfast in Perth on Tuesday.
SA and Tasmania are seen as swing states critical for the 'yes' campaign to achieve a four-state majority in the referendum, with most West Australians and Queenslanders widely tipped to vote 'no'.
Labor senator Marielle Smith said she has had positive conversations with people when she campaigned in her home state of SA.
"The more one-on-one conversations we can have on the ground, the better," she told AAP.
"I think generally South Australians see that the path we're on clearly isn't working and they want to support a positive change that will have a meaningful impact on the lives of Aboriginal and Torres Strait Islander people.
"That's what the voice will deliver and I feel confident that Adelaide will warmly embrace it."
Yes23 says support on the ground is growing with droves of volunteers who have never joined political campaigns signing up to doorknock.
Inner-city Adelaide is seen as the crux of the SA campaign, with the state's regions expected to return a high 'no' vote which will need to be offset in more progressive metropolitan suburbs.
A recent poll put support in SA at 46 per cent, but it has been as high as 54 per cent.
Pundits expect Victoria and NSW to vote 'yes', but concerns remain about how the latter could swing given a large number of multicultural and traditionally conservative voters in areas like western Sydney.
The high cost of advertising in Sydney means smaller regional hubs like Wollongong could be bombarded with ads in coming weeks as the campaign ramps up.
The prime minister maintains the state isn't a write-off for the referendum.
WA independent MP Kate Chaney said the feeling on the ground was that the state could defy the polls.
"If you believe what you see in the media it doesn't look too good, but I'm finding that when you get out and actually talk to people it's much more hopeful," she told ABC radio.
"People aren't actually so easily duped by the fear-mongering and ... I think that common sense and goodwill will actually win the day."
Mr Albanese called on Australians to be informed about the proposal and constitutional change as opponents push the slogan: if you don't know, vote 'no'.
Those spearheading the 'no' campaign say the push to enshrine an Indigenous consultative body in the constitution is legally risky and divisive.
© AAP 2023