It is a familiar complaint that newspapers only report the bad news. But that applies to economic news, too -- particularly with a presidential year coming up. By all objective indicators, the news about the American economy has been remarkably good since the summer. But what is good news for ordinary people can be bad news for politicians, just as good health is bad news for morticians. For some strange reason, recent Democratic candidates have been looking for the dark cloud behind every silver lining. They seem to think voters always want to hear the U.S. economy is fundamentally rotten...