14/12/2015 5:18 PM AEDT | Updated 15/07/2016 12:51 PM AEST

'Doing It For Allison': Thousands Lobby Attorney-General To Overturn Baden-Clay Manslaughter Ruling

Supplied / Fairfax Media

Thousands of supporters have rallied behind the family and friends of murdered mother of three Allison Baden-Clay in an outward plea to overturn the downgrading of her husband Gerard Baden-Clay's conviction to manslaughter.

The ‘Doing it for Allison’ campaign was launched over the weekend and plans, in part, to urge the Queensland Acting Attorney-General to appeal the decision made by the Court of Appeal.

Campaign organisers have arranged a rally that will take place on Friday December 18 in the Brisbane CBD.

The campaign comes several days after the Court of Appeal set aside the murder conviction of Gerard Baden-Clay, finding he may have unintentionally killed his wife in April 2012.

It has been shared widely on social media and has attracted support from high-profile Australians and media outlets.

“...This tragedy has taken a mother from three beautiful girls,” said campaign spokesperson Nicole Morrison on the Today Show this morning.

“Allison was so quiet, gentle and unassuming that she would be really overwhelmed by this reaction to the downgrade and she would be so humbled (I am sure) by the collective community support to see that justice is served for her.”

Over 77,500 people have signed an online petition created by the Australian Missing Persons Register, urging the Acting Attorney-General to file an appeal against the decision.

On December 8, the Acting Attorney-General Cameron Dick said he was considering the legalities of a successful appeal.

“I have requested legal advice today about the prospects of success on an appeal against the decision of the Court of Appeal involving Gerard Baden-Clay,” he said in a statement.

“Once that advice has been received and considered, a decision will be made as to whether an appeal should be lodged.”

The Acting Attorney-General must make a decision on any possible appeal within 22 days, and has responded stating his position has not changed.

"As I said on Friday, I understand the deep community concern and interest in this case, but our responsibility to the family of Allison Baden-Clay, to all parties involved, to Queenslanders, is to take the time to get the decision right," he said.

"I have spoken to the DPP (Director of Public Prosecutions) and I've told him I don't want a rushed job with this, I want the right job to be done...this is a case that involves complex matters of law and matters of fact."

According to the Acting Attorney-General, an appeal would involve a two-stage process that would see an an application for special leave to appeal lodged and a second substantive appeal made.

If successful, the appeal could change how circumstantial evidence is dealt with in the courts.

The Acting Attorney-General has been sought for comment.