point taken but I'm not sure they are the most powerful (or less powerful) than others. Its dependent, I think, but there are places where teachers unions are a powerful bloc, media, labor unions, R&D blocs, etc, etc.
But, yes, Ideally, we would be a genial blend of averages with outliers spread out here and there but it is like almost anywhere you look...you see interest groups that tend to attract certain supporters and others that do not (Not saying it is perfect, flawed, or otherwise, just that it is).