It's all explained in this article from 1999 which is the one he probably got his information from. No one had to "hunt" for information like this. The writer of the article is a prominent pro-life doctor who endorsed Mitt Romney in 2007. The idea that a pregnancy from rape being rare has something to do with a "core belief" makes no sense to me. It's a tangential discussion that makes no difference on what his votes are going to be in any way.
http://www.freerepublic.com/focus/f-news/2921696/posts
“No one had to “hunt” for information like this”
This was a minority opinion, that he referenced concerning his belief about rape. A learned thoughtful person would have used critical thinking to form an educated opinion, especially on a subject as sensitive as rape.
If this is the thought process of this man, then I don’t want to have him as my senatr .
He will be gone in two weeks.