Labor MP Stephen Jones holds the seat of Throsby with a margin of 12.1 per cent, but a large field of candidates could chip away at this lead at tomorrow's election.
The former union boss won his seat outright in 2010 with 50.5 per cent of the primary vote, despite a 7.7 per cent swing away from Labor.
The Throsby representative spent his first term in government as one of the 43rd Parliament's most vocal MPs, addressing a number of controversial issues in his many speeches.
He made waves last year for putting up a private member's bill to legalise same-sex marriage, and then gained widespread support earlier this year when he put forward a bill to ban the advertising of odds during live sports events.
"I always said that I was going to be an MP that was going to take a stand on issues, even if they were tough ones," Mr Jones said.
"I've got a combination of bouquets and brickbats for it, but I think at the end of the day people would have to agree I was willing to take a tough stand on things."
Mr Jones will face a strong Coalition contest on the ballot paper tomorrow, as Nationals' celebrity candidate Gary "Angry" Anderson and Liberal Party newcomer Larissa Mallinson both contest the seat.
Throsby is one of just 10 electorates out of the 150 nationwide to have a three-cornered contest.
In 2010, then Liberal candidate Juliet Arkwright gained 30.31 per cent of the primary vote, while the then Nationals' hopeful Alan Hay gained 5.32 per cent.
Shellharbour Greens councillor Peter Moran will again contest Throsby for his party, after he won 11.9 per cent of the vote in the 2010 election.
Also appearing on tomorrow's ballot paper - one of the largest in Australia - are Palmer United Party's May King, Christian Democrat John Kadwell, Democratic Labour Party representative Brian Boulton, the Non-Custodial Parents Party's Wayne Hartman, independent Paul Matters, and Elrond Veness from the Bullet Train for Australia Party.
The electorate of Throsby covers a diverse cross-section of the Illawarra and Southern Highlands, taking in Port Kembla, Warilla, Albion Park and Dapto as well as Robertson, Moss Vale, Bowral and Mittagong in its 1422 square kilometres.
At July 31, there were 97,246 people enrolled to vote in the electorate.
Throsby has been in Labor's hands since it was created in 1984, with Colin Hollis holding it for 17 years and former Australian Council of Trade Union president Jennie George holding it from 2001 until she retired in 2010.
As the election approaches, Mr Jones said his priorities for Throsby remained Labor's "bread and butter issues" of infrastructure, education and health.
This is evident in his long list of costed promises for Throsby, which includes $50 million to attract private investment in the Maldon-Dombarton freight rail line, a number of community jobs grants and more than $5 million for schools and trade training centres.
Ms Mallinson said she did not believe Labor had the money to spend on the freight rail line, but said she had been fighting for better sporting facilities in her electorate since being pre-selected last October.
She said she supported the Home of Football complex, to which Labor had pledged $7.4 million.