1) The founding fathers of the United States were not conservatives. They were progressive radicals.
2) Education is by nature progressive. As we educate ourselves, and make new discoveries, we discover that our old views were wrong. That is why we don't conserve those views. Instead, we progress on to the next, more accurate idea.
3) University professors, who are the most educated and brilliant people on this planet, are overwhelmingly liberal. This is not indicative of some vast conspiracy. The fact that our best and brightest are liberals does, however, tell you something about the mental capacities of those who cling to conservative viewpoints.
"Although it is not true that all conservatives are stupid, it is true that most stupid people are conservative."
-- John Stuart Mill