Former Liberal Member for Macarthur and ultramarathon runner Pat Farmer has asked for voters to back the Voice to Parliament on arrival in Sydney during his run around the nation in advocacy for the proposal.
Mr Farmer is running almost 15,000km around the country's coastline on his 'Run for the Voice', already covering Tasmania, Western Australia, the Northern Territory, Queensland and part of NSW before going to Victoria and on to Uluru through part of South Australia.
It follows similar efforts, including his run from the south to north pole to raise funds for water sanitation between 2011-12.
At Sydney's Opera House on Tuesday, Mr Farmer cited the Voice as an "olive branch" offered by Indigenous Australians "to all of us to join together and to move forward together on into the future".
"That's why I felt it was important that I dedicate six-and-a-half months of my life in actions rather than words to show the Australian people how much I cared about the future of this nation as a patriot," he told reporters.
"And how much I cared about the future of this nation as one nation moving forward together with the First Nations people, the Indigenous people of this country."
In reflection of his previous campaigns for international benefit, Mr Farmer said "now it's time to clear up the mess in our own backyard," pointing to water safety, poverty and health gap difficulties in First Nations communities.
He later turned to issue a plea for older Australians ahead of the referendum.
Within indications of the public's turn away from a 'Yes' vote in recent polling, older age brackets have presented a strong preference against the Voice.
Newspoll data released August 6 reported 62 per cent of respondents aged between 18-34 supported a Yes vote, declining to 28 per cent for those aged 65 and over.
Almost identical numbers in the reverse presented for a 'No' vote between the same age groups.
"It appears to me that there is nobody under the age of 35 that doesn't get that this is a complete no brainer. That is this is something that just should absolutely happen," Mr Farmer said on Tuesday.
"What they are flabbergasted about is the fact that we even have to vote on it.
"I say my journey is for all those people that are beyond that age. I say to all of them, wake up, let's not leave this to our children and our children's children to fix the problems of the past.
"They've seized the moment, let's seize the day. While we have a moment in time, let's take it, let's change and let's vote yes."
Mr Farmer said a conversation with his 28-year-old daughter sparked his decision to take on his run.
