Hunter, it definitely doesn't seem like that in the urban centres of America. I believe those stats, but I would like to point out that at this point in time Hispanic is a cultural designation on the census and not a racial one, such that Hispanics are classified as White Americans despite that many would now make the racial distinction.
Re: The original topic. It's quite well known that the internet is young, atheist, libertarian, and listens to metal. Now it's true generally that younger people tend to be more liberal, but it does seem like libertarians take up a large part of the online population, including the youth. I have no doubts that the youth of the next generation will be more socially progressive than the last, but I'm not so sure whether they'll be as economically left leaning as is stereotypical in our time. I'm pretty sure the next generation will be more atheist/nonreligious than ours as well.
As for this site, I would say it's more left leaning. On the whole, people here are more socially progressive. It's harder to find decent support here for interventionist American foreign politics, the death penalty, or the sanctity of heterosexual marriage. Have we ever had a debate about illegal immigrants? The only issue I'd say that does lean to social progressive here is probably abortion. Otherwise people are pretty left-leaning here in terms of classically leftist stances on issues.
Maybe for economic issues we're more evenly split. I'm happy to note that we have some centrists among us despite that it's usually a bitter feud between libertarians and socialists. Maybe I'm biased, but I think there are more active socialists on the forum. I've only been more recently active but often when I would skim the forum I would find the usual liberal suspects (Jamie, dexter, etc.) ganging up on TGM. I think I've been able to take some of the heat off him in the past few threads haha.
There are probably more atheists on this site than theists (at least in terms of active forum participation), though we do have some excellent theistic representation who always seem ready to take on atheism. Crazy Anglican comes to mind.
Then there were the old days when diplomat was our resident teabagger, Sicarius the anarchist, oh and Invictus used to participate extensively in forum debates to inject a more realist perspective. We still have some great characters nowadays. Acosmist probably holds the title for highest sarcasm per word density. In just seven words he oozes more sarcasm than most people could fit into four hyperbolic rhetorical questions.