FROM TOP TO BOTTOM.Here is an interesting statistic. National polls show Wesley Clark running at the top of the field. But, polls in Iowa and New Hampshire, the first primaries, show him at the bottom. It is hard not to be cynical, but it is becoming harder and harder to believe in polls. You have to know who did the poll and who they talked to before you can really decide if they mean anything. Like most everything else in American media, the results are often manipulated. They way t.v. is going at the moment, they will probably show John Ritter running ahead of the pack.