I think when it comes to the political leanings of a student body, most prospective students will be ok, regardless of their personal beliefs, as long as the prevailing sentiment is not militant – debate is good; silencing voices is not.
Also, even at a really small school of (for instance) 1200 students, chances are that at least a handful will hold similar beliefs.
So, you know, a conservative choosing Vassar might seem odd, but as long as he or she is able to voice opinions without fear or threat of persecution, it can be a rewarding experience. Same with a left-winger at, oh, W&L, Wheaton or BYU.
If the political climate at a school is not one of violence or persecution, kids can concentrate on other variables when making a decision – as it should be. And I think that is the case with these three excellent schools.