One thought - it would seem in naming Gov. Palin as VP choice, Sen. McCain gives voters a choice to make "history" with his ticket, as well as Sen. Obama. As I saw here in Massachusetts, many voters cross-lines to be "part of history" - perhaps Sen. McCain has blunted the force of Obama and the cross-over voters for "history sake"? A bit different than Mondale and Ferraro, where, yes, you would have been voting for a historic choice, BUT, there was no competing "historic figure" or competing choice on the other side (Reagan/Bush).
On aother point, perhaps her inexperience makes McCain look more experienced (ala Dan Quayle and GHW Bush) and is less than a liability than we think?
Just a thought, not too many have expressed.