If Hillary endorses Dean the week after New Years, then we'll know that what we thought was an internal power struggle was really choreographed for maximum impact. First Gore, then her.
As a matter of fact, it would not completely shock me if Hillary gets tapped for his VP and he announces, much like Bush did, that Clark would be his SecState or SecDef if elected.
Or we'll know that she got a clue and tried to get out in front of the parade.