The RNC can want whoever they want to want, but its up to the rank and file to pull the levers on the primary days. Each RNC member (theoretically) gets one vote each, just like we do.
Of course, it was the rank and file GOP who pulled enough levers for McCain, so who knows who we'll get next time.
That's total hogwash. The rank and file GOP (or conservatives) never got a chance to vote on the conservatives in the primaries, because the first four states eliminated them, in their open elections. The first four states represent less than four percent of the US population.