A new piece in First Things addresses that question. The author looks at passages from The Audacity of Hope about Obama's 2004 Senate run against Alan Keyes. I find it intriguing that Obama admits that Keyes "got under his skin" when he accused Obama of not being Christian in his views on abortion. The still, small voice of conscience, perhaps?
In the end, Fr. Oakes concludes that, no, Barack Obama will probably not ever change his mind on abortion. He's probably right - even if Obama did change his personal views, changing his policy positions would probably mean the end of his career in politics. It's inarguable that the pro-choice position is a fundamental part of the Democratic party platform these days. If Barack Obama woke up one day and announced that he was anti-abortion, we'd see the Obama lovefest change to a hate-fest pretty darn quick. I think he thrives on the adoration of the masses, and I don't see him doing anything to jeopardize his status as Our Beloved Leader anytime soon.
Still, we can but hope. God did after all soften the heart of Pharaoh...I don't doubt Barack Obama is any more hard-hearted.