Journalism changed under Trump — will it keep changing under Biden?

Journalism, by taking an increasingly oppositional stance toward the Trump administration over the past four years, has begun to transform itself far more fundamentally than any digital technology (blogging, podcasting, the iPhone) ever has.

For the past 60 years — the occasional well-publicized in-depth investigation aside — most political reporting in the United States has tended to set the boundaries of the possible somewhere in between the positions of both political major parties. Journalists have relied heavily on elite sources (officials in government — not just politicians themselves but their...