CNN did not say he was suspending his campaign. Read the tweet. I agree it could be taken that way but a professional would have verified first. Someone on Cruz campaign needs fired for not doing what an intelligent profession would have done.
The Cruz Team has no moral obligation to verify a CNN report.
If the Cruz Team wishes to disseminate the CNN report, they do have a moral obligation to put the report in its correct context, so that caucus goers could decide for themselves what Carson is doing.
For example a good way for the Cruz Team to pass along the information would be to say, "CNN is reporting that Carson is heading home for two days and will not be going to NH or SC".
A example of a bad way would be to say "Carson is suspending his campaign".