The High Court of Australia may have rejected the challenge to the government’s $122 million postal vote on same-sex marriage, but it appears the group doing the challenging expected to lose anyway.

Minutes after the High Court’s decision, The Equality Campaign released new TV and radio ads encouraging people to vote “yes” with the tagline “Let’s get this done”.

The 30-second spot stars gold medal winning swimmer Ian Thorpe, alongside the Sydney Convicts – Australia’s first all-gay rugby team – and long-time marriage equality supporter and Uniting Church minister, reverend Murray Fysh.

Tiernan Brady, executive director of The Equality Campaign, said: “We are in it to win it. We are committed to doing all in our power to ensure that the long held wish of the Australian people for marriage equality for all Australians is reflected in the results of the survey.

“This must be a campaign of millions of respectful conversations that unites the country. We haven’t a moment to lose and we are hitting the ground running with hundreds of thousands of supporters talking about why marriage equality matters.

“This is a vote about the worth, dignity and status of members of our family, friends, workmates and neighbours, and across the country people are standing up for them.

“Today the campaign releases new TV and radio advertisements calling supporters across the nation to get out and vote.

“We know that the Australian people support marriage equality but no one can be complacent – it is all about getting as many surveys returned as possible.

“We call on everyone to participate and to talk to their family and friends to make sure they do too. Together, let’s get this done,” Brady said.