It was appropriate for Cruz to apologize for his staff's unintentional mistake, but that's all this was -- not intentional campaign fraud.
I'm tired of reading accounts of this non-event that pretend that unethical Cruz cooked the whole thing up. Even if Cruz was unethical, which I don't believe, while such a stunt might have helped him slightly in Iowa, but it would definitely have hurt him in all subsequent primaries. That's blatantly obvious, and Cruz is not dumb. He would not have done it.
but it would > it would