It looks like the Iowa Poll has had a major effect on the campaigns already:
http://www.nytimes.com/2008/01/01/us/politics/01cnd-campaign.html?_r=1&hp&oref=slogin Mr. Obama seemed to have a fresh bounce in his step as he set off on his first fly-around tour of Iowa. At the first of four events on the day, he addressed an audience of more than 1,000 people in Des Moines, saying: “I think 2008 is going to be a good year. That’s what I think. I think some big things might happen in 2008.”
While Senator Hillary Rodham Clinton, President Bill Clinton and their campaign advisers publicly projected confidence and optimism, hitting the campaign trail with brio Tuesday morning, there was substantial surprise and consternation behind the scenes.
Mr. Edwards began a 36-hour marathon campaign swing on Tuesday, starting with an event with than 500 people in Ames.
"I don’t need a poll to tell me that we’re moving," Mr. Edwards said.
"We’re moving every single day."
Just from watching a few events on TV, I could tell that there was substantially more energy at the Obama event. He looked more relaxed and confident than I've ever seen him. This is in stark contrast to the days before the poll when it looked like his campaign was growing increasingly desperate. I didn't give him much of a chance of winning before, but now I think he has a decent shot at pulling an upset.