At 15-under-par 129, Campbell, who shot 6-under 66 in round two, leads first-round leader Pat Perez (73) and John Senden (63), who are tied at 11-under 133. Perez shot a tournament record 60 in Wednesday's first round.
Mike Weir (69) leads a group of nine players at 8-under 136. Also in that group are Billy Andrade (68), D.A. Points (67), Richard S. Johnson (69), Joe Ogilvie (70), Scott Verplank (68), Joe Durant (65), Lee Janzen (65), John Huston (71) and Alex Cejka (67).
The event is being played on three different courses.