From the blog, Secular Right: Reality and Reason:
Remember that Ronald Reagan signed a bill which loosened abortion laws in California in the late 1960s. George H. W. Bush had supported abortion rights until 1980, and his father had close ties to Planned Parenthood. This is not to say that I deny that those who oppose abortion do so sincerely. Rather, my point is that the “Culture Wars” which we see around us today may seem clear, distinct, and natural, but their shape was far different even a generation back. The flip side of this is that many atheists can not understand how one could be pro-life and atheist, but I would offer that to a great extent this too is an expression of the evolution of a group identity and coalitional politics. There are prominent atheists such as Nat Hentoff & Christopher Hitchens, who oppose abortion rights.