The Bloomberg story on the Koch Brothers is a complete smear job: http://www.powerlineblog.com/archives/2011/09/bloomberg-legi...
Statists don't like the Koch's because they hate anyone who believes that people should be free to make their own decisions without being ordered about by small-minded busybodies whose self-image depends on the delusion that they know what's best for everyone else. And rather than engage in debate, they find it much easier to just demonize their opponents with dishonest ad hominim attacks.