Likewise, the political press has decided that its job isn’t merely to inform the public but also to take down the current White House, even if such efforts cost journalism what little credibility it has left. Last Thursday, hundreds of newspapers nationwide simultaneously published editorials attacking Mr. Trump in the guise of promoting a free press. The president regularly accuses news outlets of biased coverage. He prefers tweets and rallies to news conferences because he doesn’t trust the Washington Post and CNN to give him or his agenda a fair shake. Mr. Trump’s base comprises tens of millions of voters convinced that the media is as eager as the Democratic Party to run their guy out of office, and last week’s stunt only feeds those fears. Journalists who don’t like what the president has said about the press might want to start behaving like objective reporters instead of liberal political activists.