He was meant to be key in promoting a 'No' vote in the Voice to Parliament referendum, but now he's quit so he can campaign for a 'Yes' vote instead.

The Opposition's Indigenous Australians spokesman, Julian Leeser, is heading to the backbench.

Today, the ABC's political reporter for Indigenous affairs, Dana Morse, on an extraordinary defection, and what it means. 

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Dana Morse, ABC political reporter