The DUP appear to be pulling all the tricks out of the bag on this one, including trading a bizarre shot at the Republic's constitutional convention.
DUP petition over same sex marriage - UTV Live NewsMr Weir continued: "It has been made very clear that same sex marriage will not be introduced in NI and the DUP is tabling a Petition of Concern to ensure that this motion will not be carried.
"We are the only party to have a united position in opposition to the redefinition of marriage.
"However we also do not believe that a Constitutional Convention in the Republic of Ireland should have any input into policy which is wholly a matter for representatives in this part of the United Kingdom to decide."
Hopefully the DUP will be thwarted on this, but given the Unionist parties' conservatism and the SDLP's vacillating, I'm not confident that it will pass. Still, well done to SF on progressing this issue and campaigning for equal civil rights for gays and lesbians in Northern Ireland.