That's just silly. The process has a lot of faults, but they're mostly around their inclusiveness. If anything, the fact that a bunch of people can visibly see the results of their respective caucuses, can report (e.g. tweet) on them real-time means that the ability to manipulate them is much, much harder.

Picture it, there's 100 people in a room who all have to move themselves around to their respective candidates and people count them and shout out the numbers.

All of the candidates are represented (they're reporting the numbers) and can hear the same numbers, all of the voters can hear them too.

It's messy, but it's probably one of the most difficult systems to "hack" in terms of real numbers since so many people know the results immediately.