The Maryland Racing Commission voted, 4-0, yesterday to not reinstate former national riding champion Jesse Davidson as a jockey.

Davidson, 42, was represented by attorney John Miles, who cited Davidson's rehabilitation and long, outstanding career prior to his involvement in the fixing of a race at Bowie in 1975.

Davidson's plea for "a chance to redeem myself and my family" was turned down by the four-man panel. Commissioner Ralph Powers was absent.

State's Attorney Alan Foreman said, "His conspiring and fixing of a race is too monstrous, too great a betrayal of public trust to ride at a Maryland track again."

Davidson is currently licensed to exercise horses in Maryland and has not been barred from performing any other race track work. Davidson said yesterday, "I'll try again. My whole life is riding. I can't write and only went to the fifth grade. I've suffered so much. Even murderers don't always get a life sentence."

Commissioner Kenneth Proctor, a former judge, said, "We are not in the business of rehabilitating people. Our job is to supervise the sport. Period."

Jollibe moved around Letters Of Life en route to victory in yesterday's feature race at Laurel. Hampton Beach was third. The winning mutuel was $11.40; the exacta of 1 and 5 paid $50.40.