I'm not a fan of affirmative action. The fact that anyone would get some sort of advantage based solely on race is comically stupid (sorry for the condescension, but while I'll agree that most issues have two sides, I strongly believe that this issue, along with gay marriage and maybe a handful of others, is just not reasonably debatable).
I agree that people who have faced disadvantages should be given some sort of advantage in this process. But equating race with disadvantage is just wrong. I am a woman of some color (clearly ethnic), but I don't feel that I have faced any 'disadvantage' because of this. While racism is alive and well, I've never found it hard to deal with the few ignorant (but often well-intentioned) people I've known. It's part of life, and nowadays in most parts of the US, it's not an enormous disadvantage. Economically, I probably have more advantages than the average applicant. Also, while I do have many ethnic origins, I don't exactly partake in those traditions. I'm not really bringing much diversity to a school, aside from my skin color and a checked box that will add to their diversity statistics.
Also, as far as political background goes, I think that's absolute nonsense. Schools tend come along with some sort of overarching purpose, which often includes conservative or liberal ideals. Students who are more liberal tend to be attracted to more liberal schools, and vise versa, and there shouldn't be anything wrong with that. While discussions might be more interesting with varied political views, I don't really think that highly of the mercurial political views of an 18 year old college freshman. I think most people change their political affiliations as they age and learn more about the world anyway. Why not have a campus mostly filled with people that agree with the college's mission statement? We don't go to college to figure out our political viewpoints. Those solidify and grow much later with experience, not necessarily knowledge.
EDIT: Also, the commencement controversies were mostly overblown by the media. Oftentimes, it was the commencement speaker themselves that withdrew after a few meager protests from a very small percentage of the student body. In one case, the speaker was completely liberal, as were the protesters! The media made it all out to be a political bashing of innocent speakers by liberal college students. I thought it was more about the wounded pride of well-connected individuals.