Its set up to give the headline article on Huckabee some credibility. I'm guessing well over 10,000 votes were dumped on Huck within minutes to bump him from a distant 3rd to 1st. They can also set up a script to give Huckabee x% of any vote cast to another candidate to make sure he stays, or increases the margin on top.
This is marketing. Remember the media frenzy over Fred Thompson entering the race? It was all about Fred 24/7 and how he was a front runner and had all kinds of support. Now we're seeing just how accurate the supposed scientific Iowa and national polls are that get conducted by these people.