Felix Jones, who had 106 rushing yards and a touchdown in the first half, did not touch the ball in the second half after carrying five times in the first half.
Smith finished with 116 yards on eight carries and two touchdowns for Arkansas (5-1), which joined the rankings after its 27-10 win last week at Auburn.
Twelve different Razorbacks carried the ball during the game for 381 yards.
McFadden scored twice in the first quarter for Arkansas on runs of 52 and two yards. McFadden finished the game with six carries and 71 yards. He also sat during the second half.
Toddler uninjured after being knocked over by Obama family dog
Martin Bashir resigns from MSNBC over Sarah Palin comments