Sadly too, there has been for some time an under current of anti-intellectualism in politics. It is my understanding that Barack Obama, as an example, is highly educated, no doubt could engage in lofty discussions… that would be political suicide.
That quote is from a letter from Jefferson to Madison.
Barack Obama famously wrote a book. A "leader" leads by example. So I have a different take than your "sadly politicians are discouraged from thinking" and it goes like this:
Patronizing and conditioning the political discourse to be at the level of 'high school civics class' is a powerful mechanism for keeping actual thinkers away from politics.
i'll give him credit for having a consistant platform and world view, but if he had his way we'd hand control of everything over to corporations -- and that's what his son is doing everything in his power to make happen.
I have to believe that even if it were true that many or most politicians in 1780 were similar to politicians today on levels that you mention that they still had a serious crop of worthy political intellectuals whereas today we have probably 0.