Well I for one believe that one's race in and of itself should have absolutely nothing to do with one's views on abortion.

Though one's culture does seem to be influential anthropologically speaking when making such an ethical decision (to have or not have an abortion etc).

That being said...

(Let’s keep in mind that the interview was not shown in its entirety and is perhaps being taken somewhat out of context and was presented there on that web site as political fodder to try and brand him as racist etc)

Santorum I believe is trying to say that it is hypocritical for a person of African American descent to take any kind of stance that a person is not a person under the law. Which some may take to also mean he is implying that anyone who is pro-choice is then also taking the same stance (the stance that it is ok to have an abortion because the child being aborted is not a person yet).

I believe he is trying to draw such an analogy because for many years in the United States there was a lot of debate by the government as to weather or not slaves (and later emancipated slaves) all of which at the time were of African decent, deserved the same rights as people or should be classified as people under the law. We even had a war about it.

His coloration imho however is a spurious one at best.