Senior Liberal Josh Frydenberg says he supports same-sex marriage and will be encouraging as many people as possible in his electorate to participate in the postal plebiscite and vote 'yes'.
'The more people who enrol the better,' Josh Frydenburg told Sky News on Sunday.
'I don't think you'll find a politician who will disagree with that. They want as much public participation in federal elections and state elections as possible.
'But when it comes to my broader position in terms of campaigning on this issue, I have bigger fish to fry and that is energy policy and that will be my priority in the weeks and the months ahead,' he said.
The energy minister said if a 'no' vote gets up, the prime minister has said the government won't be bringing to the parliament a private members bill and a free vote on the issue.
Marriage equality campaigner and Liberal councillor Christine Forster says she believes the same-sex marriage decision should have been made by the parliament.
'That's what we elect them to do, to make decisions on policy on our behalf, to represent us,' she told Sky News on Sunday.
'The government made a commitment, and it chose the path of path of plebiscite being the way to decide this issue, giving the people a say.
The High Court will hear a challenge to the same-sex marriage poll on September 5 and 6, just a week before survey forms are due to be mailed.