As Dusty Baker officially ended one notable chapter in his illustrious career, he said Thursday he feels an obligation to do more around the game with his next one. Baker, 74, confirmed his retirement at a press conference following his fourth season managing the Houston Astros, who came one win shy of reaching the World Series for a third straight year with a loss to the Texas Rangers on Monday night in Game 7 of the AL Championship Series. Ten of the other 11 managers who have accumulated at l