From the Washington Post editorial board:
Attorney General William P. Barr entered office with more credibility than many Trump appointees. A veteran of the George H.W. Bush administration, Mr. Barr avowed loyalty to the Justice Department’s mission and, nearing the end of his career, seemed to have little incentive to serve as another Trump sycophant. Yet Mr. Barr has lit his reputation on fire, and he just added more fuel in his Wednesday testimony before a Senate panel.
Mr. Barr failed to acknowledge the alarming nature of Mr. Mueller’s analysis on whether President Trump obstructed justice, and he did not explain why the special counsel declined to say whether Mr. Trump was guilty of the charge. This really matters: Given the damning account in Mr. Mueller’s report, what appeared to be keeping the special counsel from accusing the president of criminal acts was not the lack of evidence but the fact that the president cannot be charged under Justice Department rules.