Somewhat both parties, but the vast majority of influence comes from the Democrat party. Have you ever seen the list of connections between Media people and Democrat party officials?
Virtually everyone is either direct blood related, or related through marriage. The Democrat Party/Media-Industrial complex is virtually the same family.
We are fools for not having taken a sledgehammer to these media corporations years ago.
Don't kid yourself. The establishment is not based on political ideology. They are entrenched K Streeters.