No, it's not. A minority, certainly. But it's not overwhelming. At my company which has probably 200 lawyers, I know of one liberal.
most good attorneys are conservative. my firm defends a lot of the left-wing class action craziness. once you've seen the havoc the leeches can create, it opens a lot of eyes. my associate, a 28 year old graduate of UT, is even more conservative than me, and that is saying something.