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Cruz didn’t thieve any delegates. He simply assured that as many delegates as possible would not “go left” if it went to a second ballot.
The rest of the delegates are not reliable in that respect.
Many disagree with your take including the Founder of this site.
Cruz had Jeff Roe running his awful campaign and Roe was most assuredly thieving candidates everywhere he could in the hopes that Trump wouldn’t get 1237 and a 2nd ballot would go Cruz or stop Trump.
As for me last year, I was one of Cruz’ strongest supporters and defenders. Coming into this year, I was ashamed I ever donated to the guy.
Two words are all that anyone needs to know about Cruz: “Neil Bush”