“The appellee and certain amici argue that the fetus is a ‘person’ within the language and meaning of the Fourteenth Amendment. In support of this, they outline at length and in detail the well known facts of fetal development. If this suggestion of personhood is established, the appellant’s case, of course, collapses, for the fetus’ right to life would then be guaranteed specifically by the Amendment.”
— Justice Harry A. Blackmun, Roe vs. Wade, 1973
So was Blackmun laying the foundation for Roe v.Wade's eventual overturn?
It's pretty easy to realize in 2013, as it was in 1973 that a "fetus" is a person.
Even 40 years ago they would try to save premature newborns.
Not something usually done to "clumps of tissue" or a diseased appendix.