Cute, the vote was not rigged, who could vote was. How does one vote when they are not allowed into the voting area? If you were not a GOPe hack official, you were not allowed in, period.
Now then, how does this make Cruz’ vaunted “ground game” look. Did he set up that plan or did the GOPe. Seems to me it was the GOPe, not Cruz, that set that up. They gave him all the votes because they felt he was the grass roots tea party candidate because contrary to the notion it was Cruz who set up the plans, the GOPe set them up because they abhorred being made irrelevant by the Tea Party in 2010. So, since they did not want the unwashed dictating a candidate any assumption they clamored for Cruz or it was his plan that worked is without merit.
The ones "who could vote" were not rigged.
I would suggest that you learn about the process in Colorado. There were 2995 local caucuses. All registered Republicans were eligible to vote for local delegates who in turn, were the ones who voted for Colorado's national delegates.