The future of pokies reform is looking shakier than ever after Julia Gillard conceded, for the first time, that the deal brokered with independent MP Andrew Wilkie does not have enough support to pass Parliament.

The Prime Minister says there is an "appetite for reform" among MPs but that has not translated into votes to pass the measure.

"We need to get everybody on the same page," Ms Gillard told Sky News.

"They're not on the same page now and that's what we're working on, and I'm continuing my discussions with Mr Wilkie in that context."

But Mr Wilkie says he has told the Prime Minister the numbers are there.

"I disagree with her. I have spoken with a number of my colleagues, including as recently as this morning, and my assessment is that the numbers are there for this to get through the House of Representatives," he said.

"I don't think that is a reason not to go ahead with this."

Mr Wilkie has also confirmed reports that he is rethinking his support for a key Government measure to means-test the private health insurance rebate.

But he says he does not want that to distract attention from his fight to tackle problem gambling.

"I don't want to be dragged down a rabbit hole on that," he said.

"It is many months since I made my original statement of support for the private health insurance means-test, but because such a large amount of time has now passed since I made that agreement, I would need to go back and check all of the information again and check for any new information before I would be able to confirm that support."

The political bargaining continues as a coalition of anti-gambling groups today launched a major push to counter the gambling industry's multi-million-dollar advertising campaign against the poker machine reforms.

The Stop The Loss Coalition will begin its campaign by sending one million letters to homes in marginal electorates across the country, arguing in favour of mandatory pre-commitment technology.

Sorry, this video has expired Get Up director Simon Sheikh discusses Stop The Loss Coalition

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The latest round of negotiations between the Government and Mr Wilkie began on Sunday, and since then speculation has mounted that the original deal would fall through.

After the last election the Prime Minister agreed to bring in mandatory pre-commitment technology at pokies venues in exchange for the crossbencher's support.

But that support has become less crucial since last year's defection of Liberal MP Peter Slipper to the Speaker's chair gave the Government an extra vote in the Lower House.

Clubs have also launched a ferocious anti-reform campaign targeting Labor MPs in marginal seats.

The Opposition, which opposes mandatory pre-commitment, says Ms Gillard's credibility will suffer if she walks away from the deal.

Nationals Senator Barnaby Joyce has released a statement accusing the Prime Minister of "ripping off" Mr Wilkie.

"It's hardly surprising that a person who ripped off the whole of the Australian people at the last election has ripped off Wilkie over a deal Wilkie made," the statement says.

"What do you say about a person? When they break their word with you once they're a fool; when they break their word with you twice, and you let them do it, your [sic] a fool."

Mr Wilkie is due to meet Ms Gillard again tonight in Melbourne.