"I'll be voting "yes" as will (my wife) Lucy", Prime Minister Malcolm Turnbull told commercial radio this week.
As many as 16 million Australians will receive a mail-in ballot asking them to vote either "yes" or "no" on the issue and mail it back by November.If a majority of ballots are marked "yes", Parliament will follow through with a formal vote in December. We can win this thing.
Andrew Pasco, one of thousands of people who packed the streets of Sydney for the "yes" campaign rally on Sunday, said he was anxious the polarising debate could discourage moderate Australians from voting.
The results will not have the power to change current legislation but could lead parliament to vote on whether or not to legalise same-sex marriage in Australia.
The government plans to pass the bill through the parliament by the end of the week.
"Many people will vote 'yes, ' as I will, because they believe the right to marry is a conservative ideal as much as any other principle", he said.
Howard said in a statement on the website of the Coalition for Marriage that there could not be changes to social institutions without wider consequences.
Those yet to show their hand include Tennis Australia and the Australian Rugby Union.
"FFA is a founding member of Pride in Sport and supports its charter including marriage equality", an FFA spokesperson said.
However, "yes" campaigner Kerryn Phelps, the former chief of the Australian Medical Association, said the survey was about unifying the nation.
A woman holds up a placard during a march for marriage equality of same-sex couples in Sydney, Australia, September 10, 2017.
Rally attendees Stephen Madden, 55, and David Long, 47, have been together for 21 years and want to get married.
"Cricket must be a welcoming environment for each and every one of us, regardless of gender, cultural heritage and - importantly in the current environment - sexuality", he said. Police declined to comment on the numbers at both rallies.