Palin trying to drive a wedge between Obama, Biden
One of the striking things that Palin is doing is that she is trying to emphasize Biden's statements against Barack Obama in the past. At least 5 different times, Palin has been pointing out discrepencies between Biden's past statements and his current support for Obama. Biden's main response to her accusations has been to attack McCain, not to directly refute any of Palin's statements.