Political bell-curve lecture

Can anyone help. I’m sure I listened to a lecture in one of the recent Mises series (probably from MisesU 2010 and later) where someone was talking about how political party positions vie with each other to be closest to the high point of the bell-curve of public opinion and that that was why we ended up with parties that look and sound pretty much the same. But I can’t find it now. Can anyone remind me whose lecture it was?

Cheers,

Jock

Tom DiLorenzo, “Economics of The Public Sector” at MU2009. He definitely starts talking about the Political Bell Curve, starts the example around ~5:30:

http://mises.org/media/5242/Economics-of-the-Public-Sector

or the speech of the same name in MU2010 (I didn’t listen through it to see if he talks about it in this one as well):

http://mises.org/media/5242/Economics-of-the-Public-Sector