While Ron had a core of dedicated followers, Rand will be the Paul to be president. Not burning the bridges is a smart play here. He is advancing his agenda where he has the power to, in the Senate.
I think Ron has a sizable following but if they don't elect those types go on to other things. Rand seems like a more solid politican and he isn't openly attacking people, he seems to want build bridges with like-minded republicans.
http://www.economicpolicyjournal.com/2012/05/jesse-bentons-586616-take-as-result-of.html http://whatreallyhappened.com/content/agent-ron-paul’s-campaign-identified-campaign-manager