Now another Hall of Famer, wide receiver Jerry Rice, has weighed in on the subject -- and disagrees with Moon.
Rice said Thursday on ESPN Radio's "Mike and Mike in the Morning" that the NFL no longer holds a bias against African-American quarterbacks.
"I think the NFL is so much further now," Rice said. "I don't think race is a factor."
Rice, who has met with Newton, said race won't keep the Heisman Trophy winner off a team's draft board, but his passing accuracy might.
"He's going to have to be able to drop back, plant himself and deliver that football," Rice said. "During his workouts, the ball was a little high, all over the place."
Rice said he was impressed with Newton's physical stature and positive attitude during their meeting.