I have only just read Christopher Blunt and Fred Steeper’s analysis of how Missouri voters became more pro-life between 1992 and 2006 (available here or here).
Their analysis highlights one factor that I did not stress in The Party of Death: that the Freedom of Access to Clinic Entrances Act, though bitterly resisted by pro-lifers at the time President Clinton signed it, ended up redounding to their benefit by giving the movement a more moderate image. On the other hand, Blunt and Steeper pay too little attention, in my view, to another factor: the spread of increasingly sophisticated ultrasound imaging technologies. On a third factor, meanwhile, we are in full agreement: The campaign against partial-birth abortion made the public more sympathetic to the pro-life side of the debate.
Blunt and Steeper find that, in Missouri, Republicans have become more uniformly pro-life and Democrats less uniformly pro-choice; that secularists have had a more pronounced shift in opinion than regular churchgoers; that higher levels of schooling no longer correlate with pro-choice views; and that young women are the most likely of all groups defined by age and gender to hold strong pro-life views.