Victorian Opposition Leader Daniel Andrews has thrown his support behind same-sex marriage, becoming the fourth state Labor leader to back the issue. The Labor Party will discuss same-sex marriage at its national conference in December, despite Prime Minister Julia Gillard stating she does not support the move.

But Mr Andrews told ABC TV's 7.30 Victoria there is increasing community support for it.

"I, like a growing number of Victorians, believe that it's unfair that same-sex couples in Victoria - indeed right across Australia - are not able to exercise the option," he said.

"The Commonwealth Marriage Act obviously is a Federal act, I think that a growing number of Victorians and Australians are coming to the view that this is unfair."

Gay rights groups say Ms Gillard's opposition is growing increasingly untenable.

Alex Greenwich from Australian Marriage Equality says Mr Andrews' position puts pressure on the Prime Minister ahead of the Labor Party's conference.

"It shows that these ALP state leaders understand and have identified that this is an issue that is important, important for the Labor party, important for their constituents and important for all Australians who believe in a sense of equality and a fair go," he said.

Source: http://www.abc.net.au/news