Well mutual friends in advance of getting together is one of the things that makes a relationship more likely to work out in long term - so it'll balance out differing political positions!
How you met reminds me of meeting the first love of my life. Student union bar, my friend knew his, and told me he was a trust fund brat so I took against him. I also thought fancying him madly meant that he was a womaniser who I must resist at all costs! I was horrendously rude, he was fascinated, and then we went to bed together and I basically never left.
The trust fund was because his dad died just prior to that. I was a twat.
It came in very useful for deposit on a house a few years later!
Anyway, he wasn't a young conservative but he was from a much more monied background than me and private school and all that. It didn't matter in the level playground of uni and not in adult life either.
Have you asked your mutual friends about him? Is he kind and thoughtful or a twat with charm? It is easier for people with an excellent education to fake being a decent sort, but that doesn't mean they're all faking. Lots are very nice.
Unfortunately the first love of my life passed away. The second, who is a wonderfully kind and loving step father to my children, is also a posh boy. (Writing this I realise I have a type 
). Went to one of Those boarding schools, even. Probably friends with yours! 
We met through work so I could easily find out that he was a good sort, to confirm my own intuition on that.