Im a political dummy, but why couldnt Scott Ludlum run for PM? Labors a laughing stock, Liberals are gross, wheres our Bernie Sanders?
Ludlam is a member of the Greens, and a Senator.
Australia has two houses of parliament: the house of reps, and the senate.
Government is formed by the largest party/coalition of parties in the house of reps
Prime Minister is the leader of the largest party in the house of reps.
To win government in the house of reps, you need to win something like 76 seats total (I think there are ~150 seats total).
The Greens have historically won a grand total of 1 lower house seat (Adam Bandt in Melbourne).
They would need to win approximately 40 more, and see Labor win about 35 to form a coalition and that is about as likely as Wii U outselling PS4.
As for our closest thing to Bernie Sanders:
Anthony Albanese is the closest plausible life-democratic socialist (Shaneus will correct me). As for people who are authentically intelligent dem-socs, then you come back to Scott Ludlam.