Personally, as much as I like Rand Paul and as much as I liked Ben Carson early on, at the end of the day, I do prefer my candidates to have some semblance of executive experience.
I can't speak for everyone in the Republican party, but you know that I like Rand Paul, but I guess that he is just too "out there" for the establishment. Which really makes the whole plan of burying Kasich all the more perplexing, considering that he has already run the political gauntlet, and is more "establishment" than either Trump or Cruz.
What is doing him in, is the notion that he would be willing to cross party lines to get things done. Oh no, we can't have that, now can we. It's almost as laughable as the Republicans refusing not only to vote on the Supreme Court Nominee, they won't even interview him, despite his conservative leanings.
As if Clinton, if she gets into office, isn't going to nominate someone so far to the left that they need a GPS to find the center?