The Flames (7-15, 3-5 Big South Conference) led 47-45 when they launched a 16-4 run, capped by Marshall's third trey in the spurt with 10:50 remaining. Liberty made 6 of 8 3-pointers in the second half.
Although ranked last in the Big South in field-goal percentage (41.4), the Flames shot 57.4 percent (27 of 47), including 66.7 percent after the break (16 of 24). The Camels (10-12, 5-3), the league leaders at 45.4 percent, shot 40.3 percent (25 of 62).
Speaks, who posted a career high, scored 17 points in the first half, making 4 of 5 field goals and 8 of 8 free throws. He has scored in double figures in 11 straight games.
Trey Freeman led Campbell with 17 points.
ESPN's Dan Dakich joins The Paul Finebaum Show to discuss the SEC's presence in the NBA Draft.
Ted Kapita was the top-rated recruit from West Virginia in the class of 2015 and recently played at DME Academy in Florida.
With the Suns drafting Tyler Ulis, they now have five guards on their roster who attended Kentucky.