Barack Obama leads Hillary Clinton in a McClatchy/MSNBC poll released at 4PM ET by a margin of 40 to 31. John Edwards has 13%.
Full results here: http://www.mcclatchydc.com/...
The poll has a margin of error of +-5%.
I'll update as more information becomes available.
UPDATE: I took a look at the full results (thanks poblano!). A few things stand out, some of which are already noted in the comments.
First, this is bad news for Edwards. He's scrambling to make threshold statewide, which is crucial for them. A push at the end will probably get them over, but I'd guess that failing to make 15% statewide is the end of the campaign. I've been around this stuff a long time and a failure here will dry up his money.
The gender and race gaps continue; Obama has a huge lead among men (42/27/17) and among African Americans (56/25/2). Age is breaking for Obama as expected, but among older voters than New Hampshire. He leads 47/21/15 among thise under 50 and trails 35/39/11 among those 50 and older. Independents are pretty evenly spliy 32/29/19.
The preferences of these voters also are fairly strong. Among Obama voters, 79% say they'd stick with their choice; 78% of Clinton voters and 81% of Edwards voters say they're going to hold. With this data, a third of the total electorate is up in the air with 15% remaining undecided.
The demographics of the sample are interesting: 59% are women and 57% are age 50 or over. 54% are African-American and 76% identify as Democrats.
One thing I did find interesting is that among voters who list Iraq as their primary issue concern, Clinton leads 38 to 30 to 17. This is probably due to the fact that more African-Americans consider the economy to be most important.
While this is probably a decent snapshot of where people are now, the caution I'd proffer is the fact that a third of voters are either undecided or could change their minds.
On the GOP side, McCain leads Huckabee/Romney/Thompson 27/25/15/13. This is well within the margin of error and is very bad news for Thompson, who needs a strong showing in SC to remain in the race. Romney's probably doing well enough to stay in given his money. The McCain/Huckabee battle for a win will be brutally competitive, either will be hurt by a loss.