Imagine you have been chosen to host a single question Presidential debate between Mitt Romney and Barack Obama. Your task is to craft a question that will prompt an answer that most clearly reveals the true colors of each candidate.
This debate will be broadcast nationwide. You will ask only one question and each candidate will have as much time as they need to respond (Let's assume that each candidate has sworn an oath to actually answer your question and only answer your question. A political fantasy.)
You will also want to avoid the appearance of leading or trapping the candidates, as any unfair question will tip the balance away from your intention.
What is your question? And why do you ask?