Be aware that Berkeley is jam-packed with business majors, has plenty of republicans, and mostly has thousands and thousands of students who mostly couldn’t care less about politics and just want to get good grades. It isn’t even remotely as leftist/extremist on a day-to-day basis as its reputation in the conservative media would suggest.
Neither Williams nor Northwestern is particularly extreme politically, there are fiscal conservatives and pro-military conservatives and old money conservatives at both of them. However, I suspect that if you walked around carrying a sign saying “Gay Marriage is Evil and Should Be a Crime” you would get a lot of pushback. Very few, if any, elite colleges are socially conservative anymore.