Pollsters say conservative lobby group Advance was the biggest loser out of the Dunkley byelection given that despite its $300,000 ad spend, Labor did not lose paint on its primary vote, and that the result brings into question the group’s role in promoting the No vote during the Voice referendum.

It comes as the Victorian branch of the Liberal Party lurches from one round of chaos to the next, with Opposition Leader John Pesutto announcing on Sunday that his chief of staff and the communications director had resigned.