A few months before Australia's conservative Liberal Party suffered its worst election defeat last May, Sydney stockbroker Angus Aitken donated 230,000 Australian dollars ($165,000) to the party, a political cause he thought he would support for life.

This year he is changing teams, committing AU$1.1 million to populist anti-immigration party Pauline Hanson's One Nation as he turns away from a conservative establishment racked by infighting and dismal polling.

Aitken is not alone.?Encouraged by mining billionaire Gina Rinehart, some of Australia's wealthiest donors are shifting support from the Liberal-National coalition to an outsider party that has, until recently, relied on small donations.