In 2016, 96% of journalists donated to Clinton, 4% donated to Trump. The numbers for 2020 will almost certainly be even more skewed Democratic. But don't take my word for it, listen to Jill Abramson, self-proclaimed liberal and former executive editor of the New York Times:
"The news pages were unmistakably anti-Trump,” Abramson writes...she describes a generational split at the Times, with younger staffers favoring an unrestrained assault on the presidency. “The more ‘woke’ staff thought that urgent times called for urgent measures; the dangers of Trump’s presidency obviated the old standards,” she writes. " “Given its mostly liberal audience, there was an implicit financial reward for the Times in running lots of Trump stories, almost all of them negative: they drove big traffic numbers..."
The Times (which I must point out is less left-biased than most media sources today) has still fired several reporters for not slanting their stories far enough left, including one episode where the reporter who drafted the neutral and accurate headline "Trump urges unity over racism" was fired, and the newspaper went so far as to recall the entire edition, to reprint it with a more negative headline:
The Daily Beast: NYT Retracts Headline.