By Laura McQuillan
A day out from the first vote on legislation to legalise gay marriage, it's still unclear how much support the bill will receive, with many MPs saying they are still "undecided".
Louisa Wall's private member's bill has its first reading in Parliament on Wednesday.
She believes the numbers are "pretty solid" for the bill to pass, with at least 61 votes needed in the 121-seat Parliament.
Ms Wall says about 16 of Labour's 34 MPs have pledged their support for the bill.
"A few of the undecideds will hopefully join our team," she told media.
Prime Minister John Key is supporting the bill, but he will be among the minority of National Party MPs doing so.
"My guess is the majority won't back it but there'll be a slightly larger [group] that are likely to vote for it than you might otherwise think - it might be in the order of 12, 13 people," he said.
He is confident the bill will pass its first reading, but the votes could change as the legislation progresses.
"You're likely to peel a few people off - that's the history of these votes as they go through - but not substantial numbers, I wouldn't have thought."
Labour's Clayton Cosgrove is one MP who is still undecided, telling reporters this morning he is "still consulting people".
Mr Cosgrove is among MPs who voted against civil unions legislation in 2004. However, other MPs - like Mr Key - have switched sides since then.
Anti-gay marriage lobby group Family First have presented a 50,000-signature petition against the bill at Parliament today.
Spokesman Bob McCoskrie says MPs who oppose the bill, including Labour's Su'a William Sio, Ross Robertson and Damien O'Connor, National's Chester Borrows and Alfred Ngaro, and NZ First's Asenati Lole-Taylor, were expected to attend.
Supporters of the bill are planning a rally through central Wellington at midday tomorrow.
The youth wings of the National, Labour, Greens, ACT and Mana parties issued a joint statement on Monday urging their MPs to vote for the bill.
NZN
The Numbers
In favour/ leaning towards in favour of the bill:
Labour:
Louisa Wall, David Shearer, Grant Robertson, David Parker, Jacinda Ardern, David Cunliffe, Shane Jones, Nanaia Mahuta, Maryan Street, Trevor Mallard, Charles Chauvel, Lianne Dalziel, Chris Hipkins, Phil Goff, Annette King, Darien Fenton, Clare Curran, Ruth Dyson, Parekura Horomia, Sue Moroney, Moana Mackey, Iain Lees-Galloway, Raymond Huo, Kris Faafoi, David Clark, Andrew Little, Rina Tirikatene, Megan Woods
Greens:
Entire caucus
Maori Party:
Entire Caucus
Act:
John Banks
United Future:
Peter Dunne
National:
John Key, Judith Collins, Hekia Parata, Paula Bennett, David Carter, Kate Wilkinson, Craig Foss, Chris Tremain, Maurice Williamson, Jackie Blue, Tau Henare, Nicky Wagner, Nikki Kaye, Jami-Lee Ross, Cam Calder, Scott Simpson, Ian McKelvie
Against/leaning towards being against the bill:
Labour:
Sua William Sio, Damien O’Connor, Ross Robertson
NZ First:
Entire Caucus
National:
Bill English, Gerry Brownlee, Tony Ryall, Phil Heatley, Chester Borrows, Nick Smith, Colin King, Paul Hutchison, Eric Roy, Kanwaljit Singh Bakshi, Tim Macindoe, Alfred Ngaro, Paul Goldsmith, Simon O’Connor, Mike Sabin