sydney 20,000 people rally sydney sunday urge legalization same-sex marriage days ahead contentious postal survey issue divide country organizers say gather australia large gay right demonstration diverse range people clothe rainbow color converge heart city insist equal right blow away response cat rise community action homophobia say force show today put us good stead win battle next couple months though postal ballot non-binding yes vote expect lead legalization same-sex marriage could fracture government prime minister malcolm turnbull ballot mail sept. 12 result expect time november country opposition leader bill shorten say law change gay community get one last mountain climb make marriage equality reality let climb together today say turnbull say vote support same-sex marriage tell gather liberal national party faithful sunday issue one everyone entitle opinion many people vote yes believe right marry conservative ideal much principle say word contrast one party previous leaders former prime minister john howard officially launch campaign saturday howard say statement website coalition marriage could change social institutions without wide consequences believe conflict seek right same-sex marriage right child believe right child mother father preserve say coalition lead campaigner same-sex marriage respond request comment include australian christian lobby greek orthodox archdiocese australia however yes campaigner kerryn phelps former chief australian medical association say survey unify nation want see australians unite marriage equality unite fairness australians say rally attendees stephen madden 55 david long 47 together 21 years want get marry world long engagement long say mum would really like legal son-in-law madden add sydney event follow similar rally melbourne last month organizers say attend 15,000 people police decline comment number rally australia one develop english-speaking countries legalise same-sex marriage despite strong popular support back majority lawmakers australia gay marriage rally draw record crowd ahead postal vote