I believe you completely misunderstood the author's point. It has nothing to do with being a First Lady or serving a President in any capicity (other than VP). The point the author is making is that if a woman can't be President, then neither can a woman be VP, since only people qualified to be President can serve as VP.
I find the author's opinion on the whole matter interesting. He may be right or he may be wrong. I'm disappointed in some of my fellow Freepers who have attacked this man so viciously for stating an opinion.
Read this again:
Because she cannot constitutionally fill the vacancy caused by the death, resignation, impeachment and removal of any US president under whom she served.
That has nothing to do with gender, and, if read literally, would also disqualify cabinet secretaries.
I find the author's opinion on the whole matter interesting. He may be right or he may be wrong. I'm disappointed in some of my fellow Freepers who have attacked this man so viciously for stating an opinion.
We have a very low tolerance for stupid, sloppy scholarship here.