You have to love the way US presidential politics works. Obama makes a comment about "lipstick on a pig" (which he has apparently used before long Palin and her lipstick/pitbull comment came along) and it gets interpreted by the McCain camp as a sexist attack on Palin.
Now we have McCain essentially making reference to experience and Obama saying "I am prepared. I am prepared. I need no on-the-job training. I wasn't a mayor for a short period of time. I wasn't a governor for a short period of time." and it becomes McCain attacks Palin's experience.
Politics huh? Don't you just love it?