the more educated are prone to irrational political opinions

I'm quite sure that this is wrong actually - that more educated folks still have better opinions about policy, but only weakly so. Bryan Caplan has pointed this out in his work on the irrationality of the common voter. It becomes right though when you control for rational judgment in private, non-political contexts - education greatly improves that and you would expect it to have the same effect in political judgments. But it doesn't, really.

average incomes are less likely to express polit