A free vote in the parliament is the preferred course of Labor, the Greens and various crossbenchers — and advocates hope the legislation for the national plebiscite will be stymied in the senate, forcing a free vote on the issue.

Peak advocacy group Australian Marriage Equality say this election has ushered more supporters of marriage equality than ever into the parliament.

BuzzFeed News confirmed at least 15 seats where an MP who opposed marriage equality or was undeclared on the issue has been replaced with an MP who definitely supports marriage reform.

In the last parliament, support for same-sex marriage was on a knife edge. With the shift of at least 15 seats, and potentially more, it appears a change to the Marriage Act would now easily pass the House of Representatives, but only if both major parties allowed their MPs a free vote.

So, which seats have seen an opponent of marriage equality replaced with a supporter?