Too often debates about AV are less like political arguments, and more like scientific discussions, where people get lost in a language of proportionality and preferences, probabilities and possibilities.
Of course, some of these things are important. But for me, politics shouldn't be some mind-bending exercise. It's about what you feel in your gut – about the values you hold dear and the beliefs you instinctively have. And I just feel it, in my gut, that AV is wrong.
To think that we (the academic community) once had him eating out of our hands, studying for a degree on Philosophy, Politics and Economics. And what a colossal failure of education that the above is DC's take on social choice theory. Not that Oxford PPE is very strong on social choice theory; I took a look the course information page; it's a nicely-designed web site, but I think you'd be lucky to graduate with a knowledge of Condorcet's theorem. And I would like to know if anything could possibly more central to PPE.
(Added 23.4.11: This article in the Guardian contains what is for me the first sighting of the Gibbard-Satterthwaite theorem in a national newspaper. This blog post by Tim Gowers proves that by voting yes, I am in good company!)