Some myths simply refuse to die. The idea that free trade hurts middle-class Americans is one of them. And one reason is that previous busters of this particular myth — such as Hillary Clinton — have now become its chief peddlers. There was a time when Clinton used to lecture unions about the wonders of free trade, insisting, "The simple fact is nations with free-market systems do better." Yet there she was at the Democratic presidential debate on Tuesday repudiating the TPP trade pact with 11 other Pacific Rim countries — a sprawling trade agreement that she herself painstakingly helped President Obama negotiate, and once called the "gold standard" of trade deals.