According to the Election Poll-Tracker displayed by the BBC

The Democrat race for Nomination is as follows:

Gallup - Obama 47% - Clinton 46% - Error +/- 3%
AP-Ipsos - Clinton 47% - Obama 40% - Error +/- 3%
Washington Post - Obama 51% - Clinton 41% - Error +/- 3%
Fox - Clinton 44% - Obama 41% - Error +/- 3%

I'd say that that is still pretty close, too close for anybody to be throwing in the towel.