It doesn’t have to constitute endorsement. If the content provided to readers is overwhelmingly left wing, the flavor of the enterprise is overwhelmingly left wing.
Do you remember when Drudge used to provide original content on occasion, or even - GASP - break open a big news story?
That’s what made him relevant. That he no longer does those things makes him no longer relevant, except from a driving web traffic point of view.
You and Robert Mueller at least have this in common: Distrust in the American citizen’s ability to think independently.