Donald Trump didn’t help Brett Kavanaugh’s confirmation with his crude mockery of Christine Blasey Ford on Tuesday night in Mississippi, but then this Supreme Court moshpit isn’t about this President. The left’s all-out assault on the judge is clarifying because it shows that the “resistance” is really about anything and everything conservative in America. Mr. Trump is its foil to regain power.

Brett Kavanaugh isn’t part of Mr. Trump’s New York menagerie, or some Steve Bannon insurgent. The judge is the epitome of the GOP...