So it seems we did not hear Gov Palin say 'You can call me Sara!; and this actually took place. We all heard her say, Can I call you Joe.
Mark Sheilds in PBS - Brooks & Shields with Jim Lehrer said Palin did say this; which we did not hear; and this was a Mccain-Palin tactic in getting Biden to address her as Sara;
Biden did not fall for it and called her Gov Palin throughout the debate. Palin did try numerously by calling Biden, Joe; hoping I think to get Biden to 'relax' and calling her Sara; and sounding condescending.