There’s an old saying that the only thing wrong with tainted money is that there “taint” enough of it. That might work for universities and other institutions that grace their halls with the names of robber barons, but it’s trouble for political campaigns. The McCain camp recognized that fact of life anew this week. The Washington Post reports that the campaign was stung by its ties to Oregon venture capitalist and political donor Craig Berkman, who was sued by former investors in a fraud case and ordered to pay $28 million in civil damages. Berkman and his wife, the Post...