Whenever Cameron was asked if he had taken hard drugs he always parroted out the line that "every politician has the right to a private past" which roughly translated as "yes I have but I'm not going to tell you about it."
But in the run-up to the mayoral elections many people in the media are asking themselves that very same question again. Hints of this were shown in the recent Evening Standard/ Yougov poll. Respondents were asked whether they agreed with the statement:
"The private lives of the candidates for London mayor don't matter to me."
The results showed that the majority were in agreement. But is this the full picture?
Because even if you leave aside the fact that the statement leads respondents to agree with it, I'm still highly suspicious of these figures. Open any tabloid or gossip magazine and you will see that a lust for sordid gossip is as throbbing as it has ever been.
If one of our leaders is a pervert or a serial cheat then we want to know about it. It may or may not alter our vote, but we want to know about it all the same.
So when politicians talk about the right to a private past, are we really willing to give them that? And is it possible, like Cameron, for them to open the door to some aspects of their lives, but then to close the door to others?
It is of course a difficult area. All of us have done things in the past we are ashamed of. But where do we draw the line between what has happened in the distant past, and is private, and what is happening in the near present and is not?
And when politicians call for a private past, are they not really asking for a private present. And if that is what they want, then what is it that they're hiding?
Because just as when anyone talks about trust, it's time for you to reach to check your pockets, when anyone talks to you about privacy it's time to reach for your binoculars.
So in the next few weeks and months as sordid details about top politicians inevitably emerge, just ask yourself this one question: "Does this person really deserve to be able to hide this from me?"