How do fraternities and sororities members vote?

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I can anecdotally confirm Mung Beans, Xahar, and Kuumo's posts- with the added observation that professional (i.e. non-panhellenic, not associated with a residential building on Greek Row) fraternities don't have quite the same "upper-crust Romney Republican" vibe as panhellenic associations, even if they are still more bougie and preppier than the student body as a whole.

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What's the main incentive to join a fraternity or sorority? What differentiates each individual one? Based on what I've heard, I'm glad that they don't have them in our unis.

There are panhellenic fraternities and sororities, which are more social in nature, generally single-sex, and are usually associated with a residential building on Greek Row. And there are professional fraternities, which are usually co-ed/mixed-gender, not associated with a frat/sorority house, oriented around a vocational field or academic interest (engineering, business, pre-law, pre-med, pre-health, community service, etc), and are less strongly associated with partying. Both types have an initiation process, dues to pay per term, and regularly scheduled events and meetings. Both types can be good ways to make friends in college and potential future networking connections. 

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At the University of Wisconsin, the precinct with most of the frats has traditionally been the most heavily Democratic precinct on campus.

It’s the opposite at UW Seattle- Greek Row is noticeably more R than the rest of campus. Not that precinct results on campus are politically representative of the student body or the faculty.

Piggybacking off of Mung Beans and Indy Texas, I’m pretty sure there’s a sorority that’s designated for Latina women that has chapters at UW Seattle and maybe WSU-Pullman. There was a Latina sorority featured in the movie 21 and Over (which was filmed on the UW Seattle campus).