Obama voted against this straightforward human rights legislation 4 times (aside from his "no" counted "present" vote), stating as the sole state senator speaking against it on the Senate floor in 2001 it would be "unconstitutional" to declare very premature abortion survivors persons because "the equal protection clause does not allow somebody to kill a child, and if this is a child, then this would be an anti-abortion statute."
In other words, if premature abortion survivors were declared legal persons, they couldn't be legally "kill[ed]" - Obama's word.
Obama not only opposed IL's BAIPA, he took a leadership role to kill it. His website still contains an ABC News quote from the IL Planned Parenthood CEO at the time stating "Obama approached her" to strategize to defeat BAIPA as well as the Partial Birth Abortion Ban. Barack Obama actually sought out PP to help him defeat a bill protecting abortion survivors.
Finally, for 4 years Obama lied about his record opposing BAIPA. In 2003 he voted against an identical version that passed 98-0 in the U.S. Senate and for which the pro-abortion group NARAL even expressed neutrality.
He then purported several times, as recently as August 16, 2008, that the bills were not identical and he would have supported the IL version had it been the same as the federal version. This was yet another LIE, which Obama's campaign finally had to recant after his actual vote tally from the IL General Assembly archive was posted online.