I know there is fear that Biden is going to have a hard time "tearing into" Palin, because of the perception that he is being "mean" to her.

 I can see where that can be a concern, since Hillary saw a big bounce after it was perceived that she was being ganged up on during the Primaries. 

But, like its been said many times before, "politics is not beanbag".  Palin might be able to get a sympathy bounce when she gets massacred by Biden in the debates, but its only temporary.  This is a serious election with dire circumstances and conservatives more than anyone understand the importance of experience and toughness.  The "sex card" might work for liberals simply because of the nature of liberalism, but I don't think its going to stick with many working class voters with their jobs, health, and their very lives at stake.

Also, do not forget that the Dems have Hillary Clinton and her 18 million votes as a effective counter-balance against the "sex card". 

Hillary will run a bus over her. 

Twice.