Lawmakers overwhelmingly approved bill late last year
Advocacy group to challenge non-binding, voluntary postal plebiscite
Advocates remain opposed to government-backed plebiscite
Plebiscite would cost taxpayers more than $100 million
Tony Abbott's lesbian sister criticized speech to anti-LGBT group
Tony Abbott’s sister is out member of Sydney City Council
Warren Entsch mocked prime minister, referenced Greek bailout
Prime minister on Tuesday blocked conscience vote
Christine Forster, brother have ‘respectful difference of opinion’
Parliamentarians to introduce gay nuptials bill next month
