Liberal Bias facts

While investigating facts about Liberal Bias, I found out little known, but curios details like:

There are experiments to determine if medias are biased, however, conservative experimenters tend to get results showing that the Media has Liberal bias while Liberal experimenters tend to get results indicating that the media has conservative bias.

A Pew survey shows that the media does have a liberal bias, numerically.

In my opinion, it is useful to put together a list of the most interesting details from trusted sources that I've come across. Here are 2 of the best facts about Liberal Bias I managed to collect.