The current ruling Liberal party was re-elected previous year after pledging to hold a plebiscite on marriage equality, however it was blocked by the Senate following criticism it would be expensive and not legally binding.
Late past year, the Australian Upper House Senate rejected a government proposal on the matter, with opponents saying they believed it was best dealt with by a free vote in Parliament.
The bill to fund the plebiscite was always unlikely to pass the Australian Senate on its second attempt due to continued opposition from a range of parties.
Marriage equality advocates have vowed to challenge the postal vote in court, saying the government might be exceeding its executive authority, casting doubt on whether the ballot would go ahead.
"We'll be pushing everyone to just take that time to vote". A final result would be secured by November 15.
During the same interview, she claimed tennis was "full of lesbians" who lead young players astray.
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Q What happens in the case of a "yes" vote?
"At the last election, we made a very clear promise to the Australian people that we would not facilitate the introduction of a bill to legalize same-sex marriage until the Australian people had had their say", Turnbull said in a press conference on Tuesday prior to the plebiscite effort falling short.
Deputy Labor leader Tanya Plibersek insists the best possible option is a free vote in Parliament this week or next.
Citizens who have a registered address overseas will also receive ballots.
Australian Electoral Commission (AEC) data released to Junkee shows there has been a huge spike in people updating their enrolment information since the plebiscite was announced.
Q What is the cost of the postal ballot?
Despite a postal vote now appearing all but certain, advocacy groups are promising a legal challenge, local media reported.
"I have other calls on my time as prime minister, but I will certainly support a "yes" vote", Turnbull told reporters.
Voting "no" would "stop political correctness in its tracks".
Instead it would be spent on a useless opinion survey given that conservative Liberal senators, such as Eric Abetz, have indicated they will not change their vote regardless of the outcome, she said.
"It is crucial that we launch these proceedings and confirm the legal validity of the postal plebiscite before $122 million of taxpayer dollars is spent on an unfair and unnecessary process only created to frustrate and delay marriage equality", HRLC legal advocacy director Anna Brown said in a statement on Thursday.
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