Hat tip Art Levine: from the Pew Poll:

White Democrats who hold unfavorable views of Obama are much more likely than those who have favorable opinions of him to say that equal rights for minorities have been pushed too far; they also are more likely to disapprove of interracial dating, and are more concerned about the threat that immigrants may pose to American values. In addition, nearly a quarter of white Democrats (23%) who hold a negative view of Obama believe he is a Muslim.

The Pew poll also hints that these folks are among the most likely to go to McCain.

Now some might argue that this party-switching among this group is (in part) Hillary's doing because she did not speak out strongly enough against the smear campaign (you know, the whole "as far as I know" and all that. Maybe, but I tend to think that the people who are receptive to this kind of smear are people looking for reasons not to support Obama in the first place - these aren't people on the margin.

All that movement "he's ahead, she's ahead" - almost certainly random (i.e., measurement error).

They are tied in the national polls.

Until you see a series of polls outside the margin of error, then there is nothing to report.