Prominent independent Kerryn Phelps wants voters to put the Liberal Party last after she confirmed a tilt at Malcolm Turnbull's former seat of Wentworth.
But the former Australian Medical Association president says if elected in the October 20 by-election, she won't be a destabilising presence and has guaranteed she won't block government supply.
The Liberal party has never lost the seat located in Sydney's eastern suburbs and won it at the last election with a 17 per cent margin.
Dr Phelps, a current Sydney councillor, says she has a steep hill to climb to win.
But she said many locals strongly followed the former prime minister, who was ousted from the top job three weeks ago.
"The people here are frustrated, angry and in despair about what happened to Malcolm Turnbull," the local doctor told reporters on Sunday.
"They don't want to see continue this revolving door of leadership."
The health communicator and same-sex marriage campaigner said voters knew Mr Turnbull supported action on climate change, marriage equality and other issues but the hard right of his party restricted his ability to speak out on those issues.
She promised to be vocal on those issues, saying it was time to bring back some integrity, stability and common sense to the federal parliament.
Dr Phelps is yet to strike any preference deals but urged voters put the Liberal Party last to send a message that "Canberra needs to be a voice for the people".
The Liberals have turned to former Australian ambassador to Israel, Dave Sharma, who was raised on the city's northern beaches before spending two decades working in the foreign affairs department.
He said voters in Wentworth wanted someone who could be a champion for their views.
"My whole job as a diplomat has been about becoming a local wherever I've gone, getting immersed in the local community, getting to know the issues and representing and articulating that," Mr Sharma told reporters on Sunday.
"I'll be taking that same attitude for Wentworth."
Labor's Tim Murray, who has the support of Malcolm Turnbull's son, and independent investment manager Licia Heath are among 11 people who have already announced their candidacy for the poll.