The Dukes (16-12, 10-5 CAA) rallied from an 11-point deficit, getting within a point on a 14-4 run that ended with Devon Moore’s 3-pointer.
Ron Curry’s 3 later gave James Madison a 70-66 lead before Devon Saddler’s three-point play got the Blue Hens back within one point.
Saddler’s layup with 24 seconds left put Delaware ahead before Nation scored his only points of the game.
Moore and Rayshawn Goins led the Dukes with 19 points. Goins also had 10 rebounds. A.J. Davis scored 16 points for James Madison.
Saddler scored 23 to lead the Blue Hens (14-13, 9-5). Kyle Anderson scored 16 and Jarvis Threatt finished with 12 points.