" ... except in cases of incest, rape, or when the mother's life is in danger ..."
but, according to a study (and never mind the country by country comparison for the state of affairs in the US) the woman's life is ALWAYS in danger in child birth ... some 14x more dangerous than a legal abortion.
http://www.reuters.com/article/2012/01/23/us-abortion-idUSTRE80M2BS20120123
So, the Romney-Ryan platform is to amend the constitution to make abortion always available to all women.
Fancy that.