Proponents of gay marriage are doubling their chances to get a Bill before parliament.

Labour MP Louisa Wall and Green MP Kevin Hague have both put their respective gay marriage Bills into Parliament's members' Bill Ballot.

It effectively doubles the chances of the legislation being drawn and ending up on Parliament's agenda.

Mr Hague says they'll both work to support the other if their peer's Bill ends up being selected.

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"Both Louisa and I are utterly committed to the cause of marriage equality, so whichever one of the bills gets pulled, we will both unite our forces behind that bill and campaign on it."