I honestly don't care what a judge's political preferences are--I would support a judge who is rabidly pro-legal-abortion, so long as he understands that it is a policy question for legislatures, not a legal question for the courts.
You would certainly not find many states rights or constitutional liberals these days, so I think you ARE kinda advocating a certain kind of judiciary.
In other words, if you were looking for the rule of law or rule of the constitution you used to be able to look in the direction of our party. I'm sad to say that that is no longer true.
Good luck in finding such a judge. Synonymous with liberal is the concept that the Constitution is "living." That means it gets redefined at their judicial discretion.