THIS LOOKS LIKE A JOB FOR… 
In What is, or was, the purpose of men’s neckties?, Cecil writes "I gather, Phil, that you do not like ties, probably because you are some kind of hippie beatnik who would rather live in the forest eating roots and berries than hold down a job like a man. But hey, no problem, I’m a liberal. "
From 1993’s How much do the animals used for fur coats suffer?: “Cecil, like any good liberal, opposes the gratuitous destruction of life. But as concerns the exploitation of animals by humans in principle, he is of the view that the means must be considered in light of the ends and, equally important, the alternatives. In the case of furs worn by the wealthy, the ends are frivolous. I don’t try to squish turtles when driving the back roads, either. But I do wear leather shoes, and plan to.”
I wouldn’t necessarily take any of this at face value, and there are indeed jokes about liberals elsewhere, but there you go. Also of note, in January 2000’s What’s up with gay marriage? Why do we have marriage laws at all?, we find
“Friggin’ liberals, some may think. But where’s the harm? If gay men and lesbians want to buck the hetero trend away from marriage and face the prospect of divorce and spousal support, why should the straight world care? No one with half a brain thinks homosexuals want to “convert” straight people, destroy the family and traditional marriage, etc. Gay marriage would serve the public interest by increasing stability, reducing the social cost when relationships dissolve (by making the disadvantaged partner eligible for spousal support), and maybe even reducing the spread of AIDS. Research to date suggests that children raised by homosexuals turn out about the same as children raised by heterosexuals, with no differences in sexual orientation.”
Cecil doesn’t call himself a liberal here, but the position he takes isn’t conservative- although he does say that the issue should be decided in the legislature, not the courts.
If you need more proof that he’s a lefty: Why are left-handed catchers so rare in baseball?, “Being a lefty myself”
From Is there such a thing as a left-handed cat?: “Cecil finds this interesting because he himself is a lefty, a much-oppressed minority. I haven’t previously had much use for cats, but when I see one now I’ll think: “Hey, bro!””