Over the years, I've mentioned James Carville and Mary Matalin's book All's Fair: Love War and Running for President many times. If you haven't read it, you should.
There was one part in particular that really made an impression on me and that was the reaction of the Bush Sr. and Clinton campaigns when they found out Ross Perot was running for President. They were all completely dismissive. They all knew him in real life. They all thought he was a loon. BUT, the American public only sees what the candidate's campaign wants them to see and the opponents can't very well say I think this person has a serious, un-medicated mental illness. So, as Perot's polls began to rise, so did the pure shock of all those that knew him.
SO, now I think about this in each and every election. I always wish there was a way to talk to someone that knows the person well, but that doesn't have a vested interest in the outcome (does that person even exist?). Unfortunately, we'll probably only ever find out about these fatal foibles in a book after the fact.
That being said, Rush Limbaugh knows everyone. And I imagine he hears everything. And, he's not in politics, so his only vested interest is free speech and a healthy free market in which to exercise that speech. Soooo, I place a tremendous amount of weight on what he says about the candidates given he is privy to all the things we never will be.
Rush hasn't officially endorsed anyone, but he has sure found a way to slam Romney and defend Newt at every turn.
And, for me, that speaks volumes.