<p>As the Democratic presidential contenders turn their gaze towards New Hampshire, all kinds of theories are being used to explain John Kerry's stunning upset in Iowa.</p>
<p>One is that his latest campaign ad, which drummed home his exploits as a war hero, was what won over the voters. Another is that by the time he got to Iowa he'd gotten better on the stump. Still another is that his organization was a lot better than people realized. And, of course, many believe that Howard Dean simply imploded there.</p>