Campaign efforts are intensifying in the race to referendum day for the Indigenous voice to parliament as new polling suggests it's unlikely to succeed.
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But senior Labor figures maintain there is still hope of the voice getting up.
Prime Minister Anthony Albanese said enshrining an Indigenous advisory body in the constitution would be a moment of national unity.
"We have five days in which Australians can have a look at what the question is - the constitutional change is very clear," he told Nine's Today program on Monday.
"There will be a body that may give advice on matters affecting Indigenous Australians and the parliament remains supreme.
"For the parliament and government, the decision-making process doesn't change but you get better outcomes if it's an informed decision."
Frontbencher Jason Clare says he's focused on Saturday's referendum, not what comes on Sunday.
"This is the political equivalent of climbing Mount Everest," he told reporters in Canberra.
"But it's worth it if what we do here helps to change the lives of people doing a tough."
Opposition Leader Peter Dutton maintains Australians would not vote for something without seeing a significant amount detail.
"Our nation's rulebook, which has been the underpinning of success in our community and in our country, doesn't change without good reason," he said.
"The prime minister just hasn't made that case."
But Mr Clare hit back at the coalition, saying they were always against it for political gain rather than engaging with the proposal.
He pointed to a report that opposition Indigenous Australians spokeswoman Jacinta Nampijinpa Price hadn't ruled out launching an inquiry into corporate donations to the 'yes' camp.
"Peter Dutton is just interested in politics and division and if you want proof of that ... they're thinking about holding a Senate inquiry and calling companies into (parliament) just for disagreeing with him," he said.
"There's the evidence that Peter Dutton has only ever been about one thing and that's him and his own political advantage ... and now about political payback."
Two surveys show the 'no' campaign still ahead days out from referendum day on October 14, despite one poll indicating a slight late gain in support for the 'yes' vote in the past month.
According to a Resolve poll conducted for The Sydney Morning Herald and The Age, more than half of voters do not support the voice, with 38 per cent in favour and 13 per cent remaining undecided.
When allowed only a referendum-style 'yes' or 'no' answer, 56 per cent of respondents opposed the change and 44 per cent were in favour - with the latter up one point since September.
Tasmania was the only state with a majority of 'yes' voters, the poll of 4728 voters published on Sunday night found.
Meanwhile a Newspoll shows 58 per cent of voters are backing the 'no' side, with support for 'yes' at 34 per cent and eight per cent were unsure.
The Newspoll of 1225 voters registered a two percentage point dip for 'yes' and a two-point increase for 'no' since the previous survey two weeks earlier.
Mr Albanese has warned it will be his last shot, saying the government won't try to establish the voice if the referendum fails.
More than 2.2 million people have already cast their ballot while a further 1.9 million applied for a postal vote.
Australian Associated Press