Not much, if you listen to apologists for the White House and State Department, even after the testimony of two previously-excluded whistleblowers yesterday at a House Oversight Committee hearing on the Benghazi attack that killed four Americans. Glenn Kessler, the Washington Post fact-checker, says that while some of what was said has already come out — somewhat reluctantly — there were in fact some new revelations. And even what we know think as established fact has new angles that carry some big implications.For instance, let’s look at the demonstration run amok vs terrorist attack narrative issue. Kessler points out that...