So what? They had to have supported someone in 2012. And the 2012 vote was a straw poll, not a regulated vote.
I will grant you that most of the delegates are pre-selected, but that's hardly a surprise. The people who want to be delegates are generally going to be people active in the party, and the people elected are generally going to be those who are better known. But people still vote for which delegates they want.
If 2012 Trump-leaning people abandoned the party after 2012, that would explain why their slates were disorganized and they had poor turnout.
Trump's claim that he took a principled stand not to participate because it was all crooked is a flat-out lie. A guy who chooses not to participate on principle doesn't have an in-state manager and campaign staff for that state, and doesn't fire the guy two days before the caucuses. Those actions on Trump's party confirm that he did want to compete, but found out too late that the people heading up his campaign were not doing a good job.
I personally prefer primaries to caucuses, and Colorado's system is particularly cumbersome. But Trump's organization screwed up badly as well.
>Trump’s claim that he took a principled stand not to participate because it was all crooked is a flat-out lie.
Official CO GOP Twitter after Cruz won: We did it #NEVERTRUMP
Nobody believes your bs.