Davidson (13-11, 9-1 Southern Conference) hit 16 of 22 from beyond the arc, 7 of 10 coming from Sullivan. The Wildcats shot 64.9 percent from the field overall.
The Wildcats went on a 36-17 run over a span of less than 10 minutes in the first half en route to a 61-44 halftime lead.
Tim Williams led Samford (10-15, 4-6) with 26 points. The Bulldogs shot 58.9 percent from the field but couldn't stop Davidson.