Derryn Hinch's Justice Party will run a candidate in the by-election for the federal seat of Batman in Melbourne.
Former independent councillor and Maribyrnong City mayor Catherine Cumming will enter a hotly-contested race between Greens candidate Alex Bhathal and Labor's Ged Kearney.
"The pundits will say the Greens are going to win it - I'm not so sure," Senator Hinch told reporters in Canberra on Wednesday.
