Not all at. The prosecutor could covene what's known as a "special grand jury" to investigate "possible voter fraud in the state of Ohio." He could then subpoena every single person (if he wanted) to come before the grand jury to explain why they switched at the last minute. You're naive if you don't think at least a few would spill the proverbial beans about "operation chaos," especially in exchange for immunity.
Then, the prosecutor, having the proverbial ham sandwich to go with those beans, indicts Rush for something. Or, if the indictment looks too iffy for even an out of control Dem, he has the Grand Jury issue a "Special Report" finding that, while insufficient evidence existed to warrant indictment, "some reasonable cause exists" to find that Rush Limbaugh and others interefered with the conduct of the Democrat primary in an effort to assist the GOP chances in November.
The MSM will, of course, jump on that report and make sure it's a front page story about how "evile Republicans" are subverting democracy. Then the narrative will become how the "racist GOP" fought to steal the nomination from Obama and/or how the "corrupt" forces of "hate radio" worked to thwart democracy.
All of which plays right into Hillary's hands, since it makes people forget how SHE tried to smear obama.
Pretty soon, Hillary's in the White House, Janet Reno's on the Supreme Court, Harry Reid is reintroducing the Fairness Doctrine, and Rush and his listener's are sitting around like Wile E. Coyote with an anvil on his head, wondering how they got tricked one more time.
I saw that TV movie. “Amerika”. Maybe you should try some SciFi.