As far as Bristol Palin is concerned, yes let's move on. But I'm sorry, there are too many unanswered questions related to the McCain campaign to simply drop this story altogether. If we're to believe that McCain Campaign knew about the pregnancy and knew the story would eventually come out, then they must have hoped to use it for political advantage: Draw the Democrats into using messy smear tactics and wait for the backlash while hoping to inspire voters' sympathy for this "typical American family" while turning the Palins into a poster-family for pro-life values. Pretty big gamble, pretty messy, but not beyond a losing campaign going for broke. How else could you possibly explain their contention that they knew about the pregnancy?
I don't think they knew. It's another example of an inept, shoot-from-the-hip, hotheaded decision gone bad. One of many we could expect from His Maverickness, if he were to be elected, with much graver consequences.