Most students of journalism are liberals, and most journalism departments are to the left of Karl Marx.
Given the demographics and the inbred nature of their business, it's unlikely that the 20 year old liberal do-gooder that started in J-school will ever be exposed to the things that tend to make 30 and 40 year old conservatives.
And most of them have a low IQ and that is why they chose journalism in the first place. The IQ requirement to get a degree in journalism is very low.