How exactly do you know that most people in the media vote dem?

There have been studies to that effect, although I am not aware of any recent studies. The ones I recall were from a few years ago. I think they documented that an overwhelming majority of the people running the major media organizations tended to vote for Democrats. It wasn't even close, as I recall. Cable news and the internet have changed the media landscape in the past few years, so I don't know whether those studies still hold. My guess is that they do, for the most part.

The problem people run into, though, is when they assume that these Democratic voters skew their reporting to the left. The history of media reporting over the past few decades shows otherwise.

I actually agree that most are probably left leaning. I just hate blanket un knowable statements.

The writers and creative types tend to be left leaning, but it has not prevented them from being enablers of the right....especailly about the Iraq war.

The right wingers tend to own the news media and do influence the direction of the reporting.