Foreign policy
As this debate goes to the foreign policy segment, one gets the sense that the Biden may have an opening here. Biden has cited his foreign policy experience in his answers, especially in the answers to Pakistan and Iran. Biden is also starting to criticize the Bush foreign policy heavily, emphasizing Bush's mistakes in regards to presidential policy towards Israel.
Palin seems to be holding on though. She is emphasizing her support for Israel, and she hasn't made any clear mistakes yet. Palin also had a funny moment when she complimented Biden for his clear support of Israel.