Who knows, maybe one day we will have an ex-actor for president.
Nuge is most likely unelectable because of how he expresses his views.
There was a long haul between Reagan the actor and Reagan the president, and he used it to prepare himself. I believe he got "politically aware" when he was elected president of the Screen Actors Guild (twice); shortly after his second term he switched to the Republican Party and supported Barry Goldwater and conservative causes generally with his speeches and activities. Got elected as Governor of California, ran twice for Republican nominee for POTUS before he made it.
I can't see that for the The Nuge to move from....spokesman... to senator would be any worse than Al Franken going direct from comic to senator. Better, in fact. I think it would be more fun if Pres Trump had nominated The Nuge for Secretary of the Interior tho. The histrionics and splodey-heads would be awesome.
Maybe ATF.