As Prime Minister Anthony Albanese prepares to unveil the Indigenous Voice to Parliament referendum date, he has denied the ‘Yes’ campaign is in trouble.

Mr Albanese will on Wednesday announce the date when Australians will go to the polls to vote on whether to entrench an Indigenous advisory body in the constitution.

Before the starter’s gun is fired on the official campaign, the ‘Yes’ campaign has focused on crucial states and demographics.

The referendum proposal must win support from both a majority of voters and a majority of states for the amendment to succeed.

That dual hurdle means a ‘No’ victory in three states would be enough to frustrate a national ‘Yes’ majority.

‘No’ campaign advertisements have concentrated in three states where published polling has found support for the Voice is lowest: Queensland, Western Australia and South Australia.

Millions undecided

Documents leaked to The Australian newspaper show the ‘Yes’ campaign is banking on persuading voters who have not yet decided whether to support the Voice.

Some 4.6 million fall into that category, 1.7 million of whom the campaign is focusing its efforts on as 30,000 volunteers knock on doors around Australia.

The newspaper reported that opposition to the Voice is weakest in WA, while women, who constitute 54 per cent of the national undecided vote, are considered a key demographic.

The Prime Minister and his cabinet were in Perth on Monday.

Mr Albanese rejected an interviewer’s suggestion that the ‘Yes’ campaign would falter because voters were distracted by inflation and rising consumer prices.

“I think when people focus on what the question is, as opposed to all the noise that’s out there, they’ll focus, and they’ll vote ‘Yes’,” he said.

Also in Perth, former foreign minister Julie Bishop weighed in on the issue at a joint appearance with the current minister, Penny Wong.

Risk to reputation

Ms Bishop said a ‘No’ vote would risk Australia’s international reputation.

“It will send a very negative message about the openness and the empathy that Australians have,” she said.

“I would be most concerned at the message this would send the rest of the world if we can’t find it in our hearts to say ‘Yes’.”

Mr Albanese rejected claims made by Opposition Leader Peter Dutton that voters could be “bullied” into supporting the referendum.

Mr Albanese said, “there is not a big gap between the positions” of the Labor and Liberal parties on the Voice.

Mr Dutton’s stance is to create a series of local and regional Voices through legislation, not by inclusion in the constitution.

“It would be tragic if Australia lost this opportunity,” the Prime Minister said.

Mr Albanese is scheduled to announce the referendum date in Adelaide, another critical battleground where the ‘Yes’ campaign has reportedly detected committed opposition to the Voice.

He is expected to announce that Australians will go to the polls in mid-October.