Braddon hopefuls Justine Keay and Brett Whiteley have made final pitches before Saturday's knife edge by-election, while a key independent candidate has backed himself to rock the boat.
The northwest Tasmanian seat, one of five heading to the polls at the weekend, is expected to be one of the tightest, along with Longman in Queensland.
The result could go Labor's way on the back of preferences from professional fisherman Craig Garland, an independent, and the Greens.
Mr Garland's credibility was attacked by Liberal Senator Eric Abetz and Prime Minister Malcolm Turnbull after it was revealed during the campaign that he pleaded guilty to an assault charge more than two decades ago.
Mr Garland, who is running largely on fishery protection and received almost 2000 votes at the recent state election, has told media he was defending a friend in a scuffle.
"I've had that much support since it was brought out," he told AAP from Tasmania's west coast.
"When they came out and started attacking me a week or two ago I knew that they were worried. And they should be too.
"They know the sort of following I've got here and they know the election is going to be tight."
Mr Whiteley, running heavily on job creation and investing in local businesses, warned against voting for minor parties.
"All other votes to any candidate will lead very clearly, very simply to election of Justine Keay and Bill Shorten, and they can't deliver anything," he said in front of a small group of vocal supporters on Friday.
Ms Keay, meanwhile, visited a GP clinic in Devonport with Senator Penny Wong and again promised to fix the state's health "crisis" and lengthy surgery waiting lists.
"The election is so important to send a message to Malcolm Turnbull that the people of Braddon want their interests first," she said.
Mr Turnbull and Bill Shorten have both visited Braddon in recent days, with the federal opposition leader expected to be alongside Ms Keay on Saturday morning.
Ms Keay has promised to fight to the very end of a lengthy campaign.
"I have to say I wasn't excited when the prime minister set the date eleven weeks out," she said.
"(But) this is a community that I love. I was born and bred here. My tank is not empty."
No opposition has lost a by-election to the government in 98 years.
