I hadn't already seen that, no.
By the way that was another reason I thought of for why Obama did better in caucuses than the primary, but just Texas-specific -- that the "keep her in it so she can win it" people weren't going to do that at the caucus, too.
But I'd believe that a segment of those 16,000 were actual Obamacans; people who either really will vote for him if he becomes the nominee, or who think McCain and Obama are the two best candidates and have to think more about which one they'll vote for.
The "one day only" thing is pretty damning, though...!
On a possibly related subject, Bill Clinton evidently went on Limbaugh on the day of the TX primary.
http://tpmcafe.talkingpointsmemo.com/talk/2008/03/wtf-bill-clinton-on-rush-limba.php