Rasmussen has an Iowa poll out. The usual disclaimers applies: Iowa is notoriously hard to poll, but it's always interesting to look, and look at the internals.
First, the general poll data:
This telephone survey of 1,007 Likely Democratic Primary Voters was conducted by Rasmussen Reports October 10 & 14, 2007. The margin of sampling error for the is +/- 3 percentage points with a 95% level of confidence.
That's a pretty good sample size for a statewide poll. Here are the results:
Clinton 33
Edwards 22
Obama 21
Richardson 7
Biden 4
Unfortunately, this appears to be the first time Rasmussen polled Iowa during this election season, so I can't compare it to a previous poll by them. However, comparing it to other polls (which is always difficult), this would confirm the upward trend for Clinton, which can be seen in the spiffy poll graphics over at pollster.com.
For Obama, it would seem that the Newsweek poll with him at 28% might have been an outlier, since most other polls over the last two months have him in the low 20s.
As for Edwards: this would appear to show him stable in the low 20s. That is not as bad as it seems, as it means that his choice for public fundraising did not have a negative impact. This poll also predates the Iowa SEIU endorsement. So, he's definitely still in it in Iowa.
Looking at the internals, there are some interesting facts. Obama is a little stronger amongst people who identify themselves as liberal. A different (national) Rasmussen poll recently showed that Obama is now seen as more liberal. So maybe there's an opening for the Obama campaign there to differentiate himself.
The good news for Edwards in the internals, is that he co-leads with Clinton in the favorability ratings, at 82%.
The good news for Clinton in the internals, is that her support is the strongest, with 59% of her supporters saying that they will definitely vote for her, followed by Edwards at 51, and Obama at 48.
Overall, I'd say that Clinton continues to have an upward trend, with Obama and Edwards stable. Obama and Edwards really need to make a move. However, as Rasmussen notes:
Given the high numbers of voters who say they could change their mind, the race in Iowa remains very fluid.