QUOTE
can you know how you are coming down on a case without an actual case?
This is a very good question. This kind of question was explored during the confirmation hearings for Justice Ruth Bader Ginsburg. If a member of the Judiciary panel asked her - for instance ( I am completely paraphrasing here - this is NOT an exact quote or even case):
"How would you have decided the Bakke case?" Her answer was, consistently, "I need to have heard that case before I can answer you."
However, nominees for the judiciary are asked all the time, and answer to the best of their ability and/or desire to inform, general questions like: "How to do you feel about affirmative action?" To which they usually answer in a more general vein - if they answer at all.
In other words the candidate can be asked specific questions (for which they need a case) or a general position question - which some answer and some don't.
Some people see this as evasive, and some see this as politic, and some see it as legally sound. It is because of the usually vague way nominees answer, that their writings and verdicts which they have formulated in the past are given such scrutiny. This history is accepted as more accurate as to the position of the nominee, rather than statements given during confirmation hearings.
Personally, I think that a nominee should be judged on judicial temperament, good character, and scholarship and that's all.