Dr. R.C. Sproul has a six-part video series on abortion that Ligonier Ministries has made freely available over the Internet.
Each episode is approximately 30 minutes in length – links below go to each individual video. The teaching is excellent (careful, logical, biblical).
What Are the Key Issues?
How Sacred Is Human Life?
When Does Life Begin?
What Is the Relationship of Church and State?
What About Those Who Demand Their Rights?
What Is Your Verdict?