Former Tasmanian Labor president Ben McGregor has hit out at his former party, saying it has made years of "horrendous decisions".
The former Clark candidate also said he was still considering suing Opposition Leader Rebecca White over comments she made that he was not fit to sit in state parliament.
Mr McGregor resigned as a candidate during last year's state election campaign over inappropriate text messages he sent to a colleague seven years ago.
He has not denied sending the complainant messages "using lewd language", and sending her a photo of a penis when she denied his invitation to go to a pub, but said they were sent in jest, with his wife by his side.
He was stood down as party president, and then formally stripped of the title by Labor's national executive in October.
Mr McGregor claimed he had been cleared of wrongdoing and sexual harassment by an internal party investigation into the complaint, but that was disputed by state secretary Stuart Benson, who said the complainant had decided not to proceed.
He launched legal action against the complainant for defamation, which finalised earlier this month.
In a statement, the complainant said she was not sexually harassed by Mr McGregor, and acknowledged her complaint had caused damage to him and his family.
Speaking to ABC Radio Hobart on Wednesday, Mr McGregor said the complaint had taken a huge toll on him.
He said he had been failed by both the state and national Labor Party, and all senior members "need to take some responsibility in this".
"This is not one person's doing, this is a party problem. Party processes were not followed across the board," he said.
"Basically, I subjected myself to a process and multiple people failed in ensuring that it happened, and that's both federal and state politicians."
McGregor urges MPs to consider if they're fit for parliament
Mr McGregor said he was still considering whether to also sue Ms White for defamation, for comments she made she made during the campaign.
"There's legal processes in place, I'm talking to my lawyers on a regular basis on how we proceed," he said.
He also appeared to suggest multiple MPs should consider resigning from politics.
"The consequence on me was 12 months of hell, the consequence on them should be seriously considering whether they're appropriate for parliament," he said.
Mr McGregor said it would be "a stretch" for him to vote for Labor at the next federal election, and said the party had "sold out" its values on issues like donation reform and poker machine policy.
He also took aim at Labor frontbencher Dean Winter, and denied the party made a mistake by not initially preselecting him.
"All he did was take votes off a sitting female member. He didn't get a quota by himself, he didn't revolutionise what happened, he got elected on the basis of other votes moving across," he said.
"This wasn't the saviour coming in and the next leader making a difference for the Labor Party.
"This is a guy who is closely aligned with [Labor MP-turned Liberal minister Madeleine Ogilvie], closely aligned to the other side of politics."
Ms White would not comment on Mr McGregor's comments.
Ms Ogilvie said she would not comment on her time as a Labor MP, but was happy to be serving as a minister in the Liberal Party.
"I don't know what happens in the Labor Party, it just seems very messy," she said.
