Maybe journalists are acting in their own interests. Trump appears to be very hostile to journalists who are critical of him. Freedom of the press is their livelihood.
Journalists are private citizens who can have preferred candidates. Why can't they donate to them, just as you or I would?
As Matt Drudge wrote on twitter recently, "Media CAN'T cover WikiLeaks Podesta shitstorm - because so much of it involves them! Will take a generation to recover from this corruption."