In my view, abortion should not be a legal issue. But the default issue is abortion at one of your links. I found this of some interest:

1997-2000 On the votes that the Illinois Federation for Right to Life considered to be the most important in 1997-2000, Senator Obama voted their preferred position 0 percent of the time.

But, then, ...

2002 On the votes that the Illinois Federation for Right to Life considered to be the most important in 2002, Senator Obama voted their preferred position 50 percent of the time.

So, as time passes, he's moving toward the Right to Life club's POV. That's encouraging?