I met this person, (let's call them Austen) through my "bible study group" (actually a pop pagan group), and when I found out Austen is a leftist, we hit it off quite well. We've been together for around a month, but we do have our differences, which I can respect. Will our differences be a problem?
If they're close enough to your political beliefs to be a leftist and not a suc, they're probably good enough. If you focus on building relationship built on mutual trust, understanding, and respect then I'm betting this difference will sort itselc out.