The liberal Slate magazine has an excellent piece analyzing this question. They're not happy about it, but they demonstrate beyond dispute that Alito is a pro-life judge to the nth degree.
The ominous conclusion reached by the piece's author, University of Virginia law professor Richard Schragger:
If Alito replaces O'Connor, both of his crucial abortion opinions in the 3rd Circuit indicate that he will not take her centrist path. But this time, there will be no moderate Supreme Court above him to put on the brakes.This is a must-read article for anyone concerned about Sam Alito's abortion jurisprudence, especially in light of concerns raised by the Planned Parenthood v. Farmer partial birth case.