I look for a couple things, and ask questions that help evaluate their:
1) Technical background
2) Product instincts & creativity
3) How they've earned leadership
4) Ability to channel multiple points-of-view
This is not a strategic suggestion, but a tactical suggestion. But a large number of candidates that I've interviewed don't do well at answering this type of question and it keeps me from giving them a good interview evaluation since I don't really have an answer.