More from that Iowa poll, from a Victory Enterprises release:

The challenge for Giuliani is found in the questions concerning abortion. Seventy percent of survey respondents classified their view on abortion as “pro-life” while 22% chose “pro-choice.” Giuliani, who has run previously as a pro-choice Republican, faces a challenging battle to maintain much of his favorable name identification once voters learn more about his positions.
In another question, voters were asked how likely they were to vote for a candidate who disagreed with their position on abortion. Sixty seven percent of the respondents said they were unlikely to vote for a candidate who disagreed with their position on the issue and 30% said it did not matter.
But among voters who identified themselves as pro-life, 78% said they were unlikely to support a candidate who disagreed with their position. “While there are currently two front runners in this sneak peek at the Iowa caucuses, Giuliani’s problem with pro-life voters and McCain’s challenge with his high negatives provide a wide opening for any of the other candidates to make a strong run at the caucuses,” said [Steve Grubbs, former Chairman of the Republican Party of Iowa]. “The bottom line is this: the Iowa caucuses are wide open for any leading candidate to win in January of 2008.”