Alan Tudge (Image: AAP/Lukas Coch)

When does private behaviour become a matter of public interest? 

And after last night's Four Corners expose, are we about to see an explosion of stories about politicians -- from both sides of the aisle -- behaving badly? 

Four Corners attempted several public interest justifications, including workplace standards and the rationale that Christian Porter, as first law officer, needs to be held to the highest standards (though a cursory look at his political performance would bring him undone on that score).