Why Isn't Rush in Jail?

Given that...

“[Ohio] law states that a voter who is challenged by poll workers to defend the sincerity of their last minute switch of party affiliation must sign an affidavit confirming their allegiance to that party’s principles.”

...and that Rush Limbaugh, B.F.I. orchestrated a large-scale movement of registered Republican voters, who crossed over party affiliation at the last minute, all of them signing the legally binding allegiance confirmation affidavit.

and that many of them not only committed the fraud (it is fair to say that, as a rule,Rush's Dittoheads do not adhere to the principles of the Democratic Party), but then boasted about it in online forums and blogs...

“Lastly, they had me sign the affirmation about switching parties and supporting the principles of the Democrat party. I said that would be easy, because they don't have any. Everybody got a good chuckle as there isn't a Democrat within 5 miles any direction from where I vote. I then proceeded to cast my vote for Hillary Clinton. Dirty as it felt at the time, I have a feeling I'll be rewarded in the long run.”

It really ought to be a no brainer for a patriotic and ambitious prosecutor to nail the obese blowhard on a number of different felonies, including (but not limited to) conspiracy to commit election fraud.

Why, then, is he not even under arrest?