DON’T WORRY (YET)For all my friends fretting that Obama isn’t winning by more than he is: first of all, you’re buying a media line that serves THEIR interests. If Obama has a big lead, they say it can’t last. If he has a small lead, they say it should be larger. If the race is tightening, they get breathless. For reasons discussed here before, they WANT the election to stay close, and they jiggle