A wise Dem source looks at the numbers and notes:

1) If Clark finishes third in OK and a poor second in AZ, he is done. I gather the Kerry people would like him to survive, because (a) he might draw votes from Edwards in VA and TN, and (b) he might draw votes from Dean in WI. They’re still marginally worried about a Dean rise from the grave.
And speaking of the Ho:
(2) You’ll note Dean is below the delegate threshold in all five states. He’ll almost certainly cross it in NM, but that’s pretty slim pickins. Look for McAuliffe to make pointed statements tonight or tomorrow about the need for losers to pull out. And look even more for something from Andy Stern, the [Service Employees International Union president,] who endorsed Dean in November. Last week Stern suggested Dean needed to win something today, or at the latest, this weekend.