Josh Marshall explains it. Josh knows:
Back up a bit from the sparks flying over executive privilege and congressional testimony and you realize that these are textbook cases of the party in power interfering or obstructing the administration of justice for narrowly partisan purposes. It's a direct attack on the rule of law.
This much is already clear in the record. And we're now having a big public debate about the politics for each side if the president tries to obstruct the investigation and keep the truth from coming out. The contours and scope of executive privilege is one issue, and certainly an important one. But in this case it is being used as no more than a shield to keep the full extent of the president's perversion of the rule of law from becoming known.
It's yet another example of how far this White House has gone in normalizing behavior that we've been raised to associate with third-world countries where democracy has never successfully taken root and the rule of law is unknown. At most points in our history the idea that an Attorney General could stay in office after having overseen such an effort would be unthinkable. The most telling part of this episode is that they're not even really denying the wrongdoing. They're ignoring the point or at least pleading 'no contest' and saying it's okay.