But why did some of the companies Bain invested in flourish while others did not? How did the candidate deal with those occasional failures? What obligations, if any, did Bain have to the communities affected by his decision-making? And above all, how does what Mr. Romney did as a private businessman translate to the very different job of being president of the United States? Those are the sorts of issues Mr. Romney should discuss, because they would have legitimate bearing on him and his candidacy.