I have become a fan of Carly, but Fiorina supported an individual mandate in 2013. Not the same mandate. A more sensible mandate. However, it is wrong either way. No matter what the NSA has and allowed Obama to use on Justice Roberts to get a decision that says otherwise, the mandate is unconstitutional.
I’m not convinced this destroys her chances utterly, and it’s going to be hard to do more than modify ObamaCare no matter who wins, but it certainly looks bad. You cannot, by definition, support and defend the Constitution of the United States of America if you support and pursue unconstitutional policies.
The problem may be a corporate background informing her views. The trouble with Republicans is that it’s OK if a corporation does it, the way a Democrat considers it good if the government does it, but then that extends to it being OK if the government does something of benefit to corporation(s). If you see an individual mandate as somehow benefiting business, especially big business, you are more likely to support it as a Republican. No principles need apply.
Perhaps it’s already time to bring back Rick Perry. He has the problem of invoking Jesus, but not to the extent of being a Christian theocrat as some Republicans might be.