"Three years after Roe, Justice Thurgood Marshall wrote the opinion for a unanimous Court noting the impropriety of deciding constitutional questions “in the absence of ‘an adequate and full-bodied record.’” In another case four years after Roe, Justice Blackmun wrote, “The problem is a complex one, about which widely differing views can be held, and, as such, it would be somewhat precipitate to take judicial notice of one view over another on the basis of a record as barren as this.”"