[OneWingedShark]

But none of the states can enforce their laws against "treason". They simply have no jurisdiction.

They must have [some] jurisdiction, because the Federal Constitution says:

Treason against the United States, shall consist only in levying war against them, or in adhering to their enemies, giving them aid and comfort.

Otherwise someone could wage war against ONE state and it not be so punishable. furthermore, the 10th amendment says:
Notice also that it says "against the United States" and some of the State-definitions sat "against the State [OF STATE_NAME]", there fore it may be perfectly reasonable to charge someone with Treason Against the State of Arizona and not the United States.
Thirdly, notice how the definition protects the States, but does not protect the federal government -- that is not, I think, by accident.

But, furthermore, the States must have jurisdiction in the cases where the perpetrator is the federal government (or at least agencies thereof)... just like in Fast & Furious.

For example, do you recall any state ever trying a "treason" case?

No, but then again, I'm not a lawyer.
There appear to be several news articles online; I can't get the NYT ones and some of the others looked like governor whining. But that was a VERY cursory look.

[okie01]

With regard to Fast & Furious, nobody's going to get charged with treason -- either by the states or by the feds.

Several charges of accessory to murder of a federal agent, both before and after the fact, would do quite nicely, though.

[okie01]

With regard to Fast & Furious, nobody's going to get charged with treason -- either by the states or by the feds.

Several charges of accessory to murder of a federal agent, both before and after the fact, would do quite nicely, though.