There is nothing unethical about mentioning a breaking news story on CNN. If Carson is not taking his own campaign seriously then his supporters deserve to know that a vote for Carson is a wasted vote.
No, that stunt was reprehensible.
Wasn't breaking news. And in that story, Carson even tells reporters "not to look into it," IOW, not to take it as a sign of dropping out. It's dirty of Cruz to tell people who are voting that a candidate is dropping out.
You're a HYPOCRITE!