Washington, D.C., is a generous and forgiving place. It's full of people who have had successful careers and made lots of money in spite of having been tragically wrong on the great issues of the day. But one sin warrants no mercy: being right. That's the problem faced by Janet Yellen, writes Steve Chapman. Yellen is the vice chairman of the Federal Reserve, who is a leading candidate to replace Chairman Ben Bernanke when he steps down next year.