Here's story out of the Washington Post pointing out that only 7% of journalists identify themselves as Republicans while 28% as Democrats. 50% identify themselves as Independents.
Of course, journalists will argue they're still objective whatever their personal views. However, worldview, how a person sees the world, impacts what they perceive happening in the world. Here journalists I suspect are overwhelmingly liberal whatever their political affiliation, even if they view themselves as Independents.