AS a former, and sometimes still active, journalist, I have a heavy interest in this.
What used to be the standard of journalism was neutrality. It didn't matter what your own beliefs were or were not; what we called, "Journalistic integrity" was paramount to reporting anything. You kept your nose out of political leanings and reported the news AS IS, and let the people make up their own minds.
But all aspects of real journalism are now dead. So called 'reporters' are a joke these days with absolutely no research done the old fashioned way; phone, investigation and footwork. It's all about opinion these days...which of course isn't news at all.
So bottom line for me; if someone voices their political opinion that's fine, as long as it is done privately and personally. Once you start broadcasting to the world your own political opinions as though someone actually gave them credence or gave two shits about it, you've compromised your ability to report neutrally. If you can't resist the urge to open your mouth and speak without regard to your integrity as a journalist I can't trust you to post anything neutrally and I will just always assume your reporting is slanted in the leaning of your political opinions.
You either are someone who has integrity and reports to the people the news, or you get to mouth off to no one in particular that you believe blah blah blah. There is no middle ground in my opinion as an old school journalist.