The only one of the bunch who seems at all capable of making any difference would be Rand Paul. That doesn’t mean I’m some sort of big fan of his, but he’s the only one who is anything other than a slightly less enthusiastic Democrat. The others are.
You consider Ted Cruz to be a Democrat?
Paul is too liberal and weak, the words floundering and searching for a position come to mind with him.
Rand Paul is the most similar to his man Mitt Romney.
Rand Paul is unelectable. The same social conservatives who refused to compromise and vote for Romney would also refuse to vote for Rand.
Securing the border is too strong a concern for Jeb, Paul, Perry, or Rubio to have a shot. Even if they could secure the nomination all four are way to far to the left on National Security.