Wait, are you saying that Hacker News is left leaning? I don't know, I think there's enough diversity of political opinion around here to prevent a broad characterization one way or the other.
I don't think the current election is a good barometer for ideology. War is a big deal to some people, and they'll vote for the person who is likely to cause the least amount of death regardless of ideology. Then there's the whole intolerance thing, which maps poorly to ideologies, but strongly to political platforms.
YC's a bit right-leaning on economic issues, but left-leaning overall.