It appears that most of the scoop is being provided by a single "former Gore staffer", who says:
"He tends to follow. This endorsement isn't about leading, it's about being told by people he respects, 'Dean is the guy, get on board now or you'll miss out.'"
And then says:
"He knows Gephardt and Kerry and Lieberman, and he clearly believes Dean is the better man this time around."
Which is it?