WATKINS GLEN, N.Y. — Tony Stewart pulled out of the NASCAR race at Watkins Glen Sunday, 12 hours after the three-time champion struck and killed a sprint car driver who had climbed from his car and was on the darkened dirt track trying to confront Stewart during a race in upstate New York. Greg Zipadelli, competition director for Stewart-Haas Racing, said at a news conference that Stewart "feels strongly" about not racing Sunday following Kevin Ward Jr.'s fatal accident. The decision was an about-face for the organization, which had said when the track opened that Stewart would be behind the wheel of his No.