Does Obama's Agnosticism Justify Infanticide?

Barack Obama hid behind agnosticism when Rick Warren asked him when life begins. But was he being intellectually honest or was his answer a ploy to hide his presuppositions about the unborn? Jay at the LTI Blog comments:

If candidate Obama honestly appeals to agnosticism on when life begins, he is obviously allowing for the possibility that the unborn may in fact be human beings and people in every true sense of the word. But he does not know that for certain, and so he supports the most radical agenda imaginable in the name of reproductive freedom. Even if a child survives an abortion, there can be no legislation enacted to protect that child from the medical staff following the mother's decision to its grisly conclusion. He defended his position by saying that there was already legal protection for children, as if he were unaware that these particular children in question were not seen as newborns but the product of failed abortions. A terrible reminder of what happens when human value is determined subjectively.