Leslie pumped in a career-high 19 points with eight rebounds while Howell added 17 and 10 as the Wolfpack (6-2) registered their second straight win.
T.J. Warren put in 16 points in a reserve role for N.C. State.
Charlie Lee led Cleveland State (6-3) with 15 points.
The Vikings got 12 points and nine rebounds from Devon Long.
Celebrity Families of 2014 [PHOTOS]