"[F]or nearly 200 years, Madison’s masterpiece made no mention of abortion. It was an area, instead, left to the States and to the people. But all that changed 25 years ago tomorrow, when Justice Harry Blackmun and the Court nationalized-indeed, revolutionized-the issue of abortion in Roe v. Wade. The Blackmun decision has sparked a quarter century of private reflection and public debate. It happens that abortion has been made the most divisive moral question of the day. Abortion strikes at the very core of who we are as a people and who we are as a Nation. It challenged us to define life and to measure liberty-difficult things both. And yet it is an issue that will not go away, and so it demands of us civil debate and reasoned discourse."