These numbers have gotten all bollixed up in another thread, so here is the correct data with the controversy explained.
First, Rasmussen Reports has had a chart page up for MONTHS that never changes. I know this because I've had disputes with people for months who cite this link as current:
http://www.rasmussenreports.com/public_content/politics/favorables/election_2008_democratic_candidates_running_in_2008_presidential_election The favorable/unfavorable numbers on that chart are ancient. Rasmussen should either update the page or stop linking to it, because this same controversy comes up every few weeks. He, along with everyone else, should also stop burying the data in sentences in an article, and post the data in a proper chart. Sadly, lots of reports of polls do the same thing... expressing the numerical data through a bunch of confusing bloviation.
In Rasmussen's
newly reported as of 12/31 favorable/unfavorable polling, here are the figures in the article:
EDWARDS: 49/42
CLINTON: 48/50
OBAMA: 43/51
McCAIN: 53/37
GIULIANI: 40/55
ROMNEY: 38/51
The other reason for the controversy is that nobody can believe Obama has higher unfavorables than Clinton, because it's a reversal of trend. What should be noted is that Obama is better known today than he was 4 months ago, so his Fav/Unfav total is higher than it used to be. (94% to Clinton's 98% and Edwards 91%) I have no idea what Obama's metaphysically true numbers are, or how this compares to other recent polling.
I am merely straightening out what Rasmussen polling is reporting. The Obama number is so startling that in a chart I would assume it was accidentally transposed, but the thrust of the article is that John McCain is now the only candidate with a favorable over 50. So it's not likely to be a typo, or McCain wouldn't be the only one over 50.
http://www.rasmussenreports.com/public_content/politics/election_20082/2008_presidential_election/daily_presidential_tracking_poll