How specifically did he do this? Publishing 'Collateral Murder' embarrassed a lot of people in Washington and probably affected elections afterwards, yet I never heard anyone make these accusations back then. And this hysteria about Russia over 40k worth of Facebook ads and some twitter bots is outrageous, Facebook/Twitters policy of censoring conservatives likely has a much more significant effect on elections than those ads and bots ever could.
>openly stating his preference as to the result destroyed any possible credibility as a "journalist" and made him look very much like a Russian puppet.
The entirety of the corporate media openly stated their preference during the election as well, to put it lightly.