Former prime minister Tony Abbott claims "same-sex couples in a settled domestic relationship have exactly the same rights as people who are married".

Despite differences over how many voters have already returned their surveys, the latest polls tell a near-identical story.

The 'Yes' campaign needs to be wary of its most enthusiastic supporters, writes Peter Brent.

The High Court has struck down the challenges to the same-sex marriage ballot, clearing the way for voting papers to start going out next week.

Opposition frontbencher Andrew Leigh is among those who claim Australia is the last advanced English-speaking country not to allow same-sex marriage.