Democrats have been staggered by a $20 million advertising blitz produced by Americans for Prosperity, the conservative advocacy group organized and financed by the Koch brothers, billionaire industrialists. The ads take aim at House and Senate candidates for re-election who have supported the health law, and blame them for the hyped-up problems with the law's rollout that now seem to be the sole plank in this year's Republican platform. In 2012 ... the Koch network raised $407 million, which was secreted among 17 groups with cryptic names and purposes that were designed to make it impossible to figure out the names of donors the Kochs worked with. As one tax expert told [The Washington Post], it's designed to make it opaque as to where the money is coming from and where the money is going." The Democrats have smaller versions of these operations, though they are more focused on building a super PAC to collect unlimited donations supporting Hillary Rodham Clinton in 2016, and they lack the resources to compete with the Kochs at this stage. The clandestine influence of the Kochs ... would be much reduced if they were forced to play in the sunshine. The Internal Revenue Service and several lawmakers are beginning to step up their interest in preventing "social welfare" organizations and other tax-sheltered groups from being used as political conduits, but they have encountered the usual resistance from Republican lawmakers. Considering how effectively the Koch brothers are doing their job, it's easy to see why.