It turns out there is quantitative proof academia, Hollywood, and the media (in the USA) actually are dominated by liberals.
In a data set provided to Business Insider, the non-partisan political analytics firm Crowdpac used information about federal campaign contributions dating back to 1980 to determine the political biases of various professions. Crowdpac found the entertainment industry, news media, and academia were among the most liberal professions in America.
Crowdpac CEO and co-founder Steve Hilton noted this data matches with perceptions about Hollywood and the media.
"In compiling all this data, and building these tools, we have the opportunity to shine some light on the political system and reveal some interesting insights and trends," Hilton said. "For example, our real data conforms with the claims that have been circulated about the extremely liberal profile of the entertainment and media sectors."