Well, I don't imagine your sister sent you the complete segment, which puts Governor Palin's comments in context.
She asked the question about what a VP does, because she wants a VP to be actually able to do something. Not just be a figurehead. IMO, it was also done in Sarah's humorous way.
The entire quote about 2:50 minutes in:
http://www.youtube.com/watch?v=Pak-rH0dCeA&NR=1
Let me know what you think!
Of course she didn’t send me the whole thing... but I found it, as well as an article where Larry Kudlow (?) stated that he thought Palin was the best choice of those who McCain was considering. As usual, left-wingers take the little bit that suits them and discard the rest.