Okay, I want to make this brief. We will continue to see more VP picks like Palin - i.e. "inexperienced" because, guess what, the vice president doesn't have much in the way of actual responsibilities compared to many others. Theoretically, they are indeed the heir apparent, but if aliens came to earth and witnessed the movements in Washington DC, the vice president would not top their list of important people. Hence, the cost of appointing someone "inexperienced" is low, and it's more enticing to pick someone who can help swing crucial demographics.
And off to work on some problem sets.