Can a Federal Prosecutor Help a “Flipper” Out with STATE Charges?

I’m not a lawyer, but can a federal prosecutor, say Mueller, help a felon like Manafort out with state charges?  I got to thinking about this question after reading the Slate article highlighted by Greg Dworkin.  I had some inkling that Manafort might be facing state charges, but Jed Shugerman goes into some great details…