They weren’t “voterless.” People voted for the delegates at caucuses.
http://www.freerepublic.com/focus/f-news/3423494/posts
Republican Primary Voters Prefer Donald Trump Over Ted Cruz
If a Republican Presidential Primary Election were to take place in Colorado, 44% of likely voters would vote for Donald Trump, 34% support Ted Cruz, 17% support John Kasich and 5% are undecided. When asked to choose between only Ted Cruz or Donald Trump, 48% support Trump and 42% support Cruz, and 10% are undecided. These results are interesting in light of the results at the Republican State Convention where Ted Cruz won all 34 delegates awarded. What the results show is a potential disconnect between the more dedicated group of delegates who participated in the state convention and the far broader group of 350,000 to 400,000 Republicans who would typically vote in a primary election.
But there was no vote and Cruz poached delegates that do not reflect the will of Colorado voters.
They were voterless