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The Kiwi Party claims it has enough support to force a referendum on the so-called anti-smacking law.
Leader Larry Baldock told the party's annual conference in Auckland yesterday an audit of signatures on its long-running petition made it certain there would be a referendum.
When the petition was handed to Parliament in February it needed 285,027 valid signatures - 10 per cent of the total registered voters on that day.
It had 324,316 names, but many were disqualified during checking and the final tally was more than 15,000 short. Organisers were given another two months to gather enough signatures, and Baldock said they had succeeded.
He said the Government Statistician had until August 23 to complete his analysis but he was "very confident" of success.
"It has been a huge task and I am relieved that this stage of our fight against this undemocratic and stupid law is now over."
Green MP Sue Bradford, the driving force behind the law, said she was not surprised there were enough signatures to force a referendum.
"I welcome debate on this issue. I'm happy to debate this with anyone, any time."
Bob McCoskrie from Family First said he was "completely confident" the petition would succeed this time. He said eight parents had been prosecuted under the law.
One had received diversion, one was discharged without conviction and six cases were yet to be resolved.
After campaigners handed in their second petition in June, Prime Minister Helen Clark said that should the referendum go ahead, it would be by postal ballot next year.