In 2003 Obama blocked a vote on a state bill which would have afforded constitutional rights to a child born alive in spite of a medical attempt at ending the child’s existence.

In 2008, when asked when does life begin [does a baby get human rights], Obama answered that was “above my pay grade”.

Given Obama’s admission that he is unqualified to judge when life begins [a baby receives human rights], how can he even begin to take a strong pro-abortion position?  Moreover, what is he doing passing judgment on the life of a child that survives an abortion? 

Remember, Obama’s position on abortion and infanticide were not merely privately held opinion, but guided his decision and legislative actions while in office.
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Update: Hanitized correctly pointed out that the question wasn't when did life begin. Although the inference is easily and correctly drawn, I corrected the post.

McCain's answer demonstrated the inference I drew as well when he answered the same queston, "at conception".