Something in David Cameron's anti-AV speech a few weeks back stood out for me:
It's not my job to tell you exactly how the system works - that's for the 'yes' campaign to explain.But even if it was my job, I'll be honest with you, I don't think I could.
David Cameron got a first class honours degree in Philosophy, Politics and Economics from Oxford University. He was taught by Vernon Bogdanor, one of the UK's foremost experts on constitutional matters. It seems rather implausible that someone could get that qualification, from that university and then not be able to explain how a relatively simple electoral system works (there are far more complicated ones out there).
One of the things that has happened in the last few decades in political life is that the upper echelons of all the main political parties have become disproportionately filled with people who have been down the Oxbridge PPE route and/or those who have been political bag carriers. Whilst I am very unhappy with this, one consolation is that at the very least they should all be fully aware of things like political and electoral systems and be able to communicate this information to the electorate. After all, being a good communicator is one of the most fundamental skills a politician needs.
So for Cameron to blithely claim he is not able to explain AV suggests one of two things to me. Either he is not being honest, or his extremely privileged education was wasted on him.