According to Barr, the statute cited by Mueller applies to criminal proceedings, not FBI investigations. Mueller has this theory that an FBI investigation could some day be a potential criminal proceeding so the law should apply to FBI investigations too, but that is not what the law says.
Scott Adams periscope today: about 31 minutes in.
https://www.pscp.tv/w/b6GbgzF4blFydkdWV3BrUVl8MW1ueGV2WkFkbFJLWB0h2wtNKQ590cEdY2BUoUGsd-aPZgj_f7UVF0uP4z8h
Discusses three things that make this petition worthless.
1, Never mentions what percentage of former prosecutors would not indict. (important for comparison)
2. He was President, doing what Presidents are allowed to do, so the fact that he was a sitting President meant that he had the right to do something that they now want to say is obstruction — it was actually doing his job so it can’t be obstruction. and finally,
3. He might be indicted by some of these nuts, but conviction is the important thing and a jury could not be found that would agree on the idea that a President who was making changes in his administration or considering the limits of an investigation would be guilty of obstruction.
Here's why people should be concerned about this inside baseball issue. If Mueller is right, darn near anything anyone does to try to protect themselves while under an LE investigation can constitute "obstruction." These are the same people who brought the corrupt prosecutions of Ted Stevens, Scooter Libby, the not anthrax perp and many others. They protected Whitey Bulger and let innocent men go to jail. You may think this just applies to Trump, but it doesn't. They are a clear and present danger to the rights of all accused people to their constitutional right to defend themselves.