When asked by an NPR reporter last week if she regretted her vote on Iraq, Clinton, considered by some to be the early favorite for the Democratic nomination responded, "You know, I really can't talk about this on the fly. It's too important."
It's possible that was an excuse not to address to sticky issue. But it's also just really smart. A politician, who has a chance to trot out a standard talking point, passes it up because some issues require substance rather than a soundbite.