When Jason Leffler was killed in a sprint car crash last summer, Tony Stewart passionately defended the grassroots racing of America. Stewart didn't once waver in his stance, even after breaking his right leg racing his sprint car last August. The three-time NASCAR champion struck and killed a 20-year-old racer who had climbed from his car Saturday night to confront Stewart on a New York dirt track following a crash caused by contact between the two cars. More...