As pointed out before, Ron Paul was a politician, and was blacked out, and Mel Gibson was a far greater celebrity than Trump, and was blacked out.
So, is a celebrity-turned-politician immune? I guess if the media ever blocks one of those out, we'll see. But in the meantime, I say the media made Trump a celebrity, and what the media giveth the media can taketh away.
I do not think a celebrity-turned politician is immune. An observation is the difference is he is a billionaire? Ron Paul was blacked out until he became a threat. Then they pulled out the ghost letters and called him a racist. More air time, but negative. If Rand became a threat like Trump is now, the media would have started bringing out skeletons and parading them 24/7.
The media has two options for control a candidate. Black out or Negative media to destroy popularity.
Trump is getting massive amount of media time, but most of it is negative. The media sets the narrative but its not working like it always has. Every article is Hitler, Racist or KKK etc. It could all be true, but it is not working this time because any trust in media telling the truth is gone. Its too late to Black out Trump now.