At a rally today, John McCain made a human error that could happen to anybody, but since it's him it's funny. First, watch the clip. Then, watch it again and just watch Sarah Palin's face. Then, watch it again and just watch John's daughter's face. Priceless: [videoembed size="full_width" alignment="center"][/videoembed] Oh, to be a fly on the wall of Obama's campaign ...