The people running newsrooms are invariably liberals.
The people running the newsrooms across the country are, for the most part, understaffed and unqualified. They are not liberal per se, but they used to have staffs. Cuts in media expenditures have resulted in the news directors scrambling to get their work done. This means a lot more packaged segments, rip and read stories, and just sloppy work.
And at the networks the reporters are more or less hired for their ability to read and look nice.
To see who has any talent, watch a breaking story where the reporters have to wing it.. Very few of them are capable.