AUSTRALIAN TREND MAP: ABC's Vote Compass shows Australia overall is supportive for marriage equality.
The legal win means the government avoids another embarrassing and bitter round of infighting over same-sex marriage, which would have seen moderate Liberals again push for a free vote in Parliament.
He tweeted his comments as Aussies begin receiving their postal ballots on legalising gay marriage.
Australia are holding a referendum on whether to legalise same-sex marriage, although the results from that are not legally-binding.
In a three-page letter sent home to parents, Sunrise Christian School principal Shane Hosking talked about the upcoming postal vote on same-sex marriage in Australia and asked them to vote "no".
The legislation was introduced because the survey is not covered by the usual safeguards governing elections in Australia.
Former Prime Minister Tony Abbot is one example.
Political scientist Shaun Ratcliff said there was a clear national-wide statistical trend towards larger population centres being more supportive of the marriage equality cause.
Frustrated progressive members said they would side with the opposition Labour Party to secure same-sex marriage if the PM could not finally resolve the issue, though some conservative lawmakers threatened to resign if Mr Turnbull did not stick to a public vote, threatening the PM's one-seat majority.
"It will be unlawful to vilify, intimidate or threaten to harm a person either because of views they hold on the survey or in relation to their religious conviction, sexual orientation, gender identity or intersex status", a government spokesman told the newspaper.
"The Business Council has long supported moves towards a fairer and more inclusive society, and I hope the tone of this debate reflects our values of tolerance and respect", Mr King wrote. Ted Cruz, who employed the pollster during his presidential campaign, called WPA the "best in the business," a quotation listed on the company's website.
It is not the first time Court has weighed into the issue of same-sex marriage.