The only surprising thing about the new “coverup” accusation against Attorney General William Barr is that it took it two weeks to get there. The question is whether Republicans fall for this naked effort to revive the collusion-and-obstruction narrative.

Democrats and the media are still smarting over special counsel Robert Mueller’s no-collusion findings, but their “coverup” fallback has its advantages. They can claim Mr. Barr’s four-page summary of the report is a sham, that he’s hiding the real truth. That’s nonsense,...