conservatives are correct in their complaints. Liberals do control the media, or the show business, or the academia, among other institutions, because, apart from a few areas in life (such as business) where countervailing circumstances may prevail, liberals control all institutions. They control the institutions because liberals are on average more intelligent than conservatives and thus they are more likely to attain the highest status in any area of (evolutionarily novel) modern life.
The Add Health study shows that the mean IQ of adolescents who identify themselves as "very liberal" is 106, compared with a mean IQ of 95 for those calling themselves "very conservative." The Add Health study is huge — more than 20,000 kids — and this difference is highly statistically significant.