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Voters in Prime Minister Malcolm Turnbull's own electorate overwhelmingly want same-sex marriage legalised and the vast majority would prefer a free vote in Parliament to an expensive plebiscite.
New ReachTEL polling conducted for the Australian Marriage Equality lobby group shows 72.8 per cent of people in Mr Turnbull's seat of Wentworth support legalising same-sex marriage while only 20.9 per cent oppose it.
But supporters clearly aren't convinced by Mr Turnbull's plebiscite policy. More than 63 per cent of respondents want an immediate free vote of MPs and senators, while only 9.6 per cent favour the plebiscite.
Just over 6 per cent haven't made up their minds.
Australian Marriage Equality national director Rodney Croome said Mr Turnbull's constituents can see that a plebiscite is an expensive and divisive delaying tactic.
"The Prime Minister's current position of supporting a plebiscite is now out of step with his own electorate," he said.
"We know from a decade of polling that Australians support this reform. We urge Malcolm Turnbull to bring back marriage equality legislation, allow a free vote and get this done straight away so Australia can move on."
The ReachTEL poll of 665 people was conducted on Thursday night, after a number of Coalition MPs revealed they intended to vote against same-sex marriage in Parliament even if the plebiscite is successful.
Liberal senators Eric Abetz and Cory Bernardi and Nationals senator Bridget McKenzie indicated they would ignore the results of the plebiscite and vote against any enabling legislation.
However former prime minister and conservative standard-bearer Tony Abbott says he believes the Parliament should honour the will of the people if the plebiscite is successful.
"This is the best way to decide something that's so important but so personal: it's to let the people decide," he said during his visit to the United States to address a conservative Christian group about the importance of the traditional definition of marriage.
"The decision, whichever way it goes, will have their authority."
Mr Abbott adopted the plebiscite policy when he was prime minister as a way of delaying a parliamentary vote on a cross-party bill put forward by Coalition backbencher Warren Entsch.
Mr Turnbull supports same-sex marriage but adopted Tony Abbott's plebiscite policy in a bid to keep conservative MPs on side. He insists the Parliament will honour the outcome, despite what the conservatives say.
"It's perfectly democratic," the Prime Minister told Melbourne radio on Friday. "If the majority of people voting in the plebiscite vote in favour of it, then same-sex marriage will be legalised."
AME revealed on Friday it believes there is now enough political support for same-sex marriage to pass both houses of Parliament – if Mr Turnbull allowed his members a conscience vote.
It believes the reform would pass the lower house with 76 votes – a majority of one – and the upper house with 41 of 76 senators. Some of those votes come from people who are yet to publicly declare their positions.
The slender majorities include those who have publicly switched their stance in the last 12 months - from both sides of the political aisle.
Mr Turnbull is yet to detail just how the planned plebiscite will work and when it will be held. But it's believed a plebiscite will cost taxpayers around $160 million. Opposition Leader Bill Shorten said that would be a waste of money.
"The time has come for marriage equality – the best way for it to happen is through a free vote in the Parliament," he said on Saturday.