The France family, who owns NASCAR, has engaged investment bank Goldman Sachs to explore a sale of the sanctioning body, ESPN has confirmed. Reuters first reported the potential for a sale, which has been rumored for more than a decade. Those rumors have increased over the past year amid NASCAR's struggles to attract fans, both in-person and on television. The three public companies that own tracks where NASCAR races take place have reported a combined attendance revenue decline of 54 percent over the past decade. Ratings for many races this year have hit all-time lows, as recent years have seen the exit of the sport's two most popular drivers, Jeff Gordon and Dale Earnhardt Jr. Three other drivers who occasionally transcended the sport, Carl Edwards, Tony Stewart and Danica Patrick, are also gone. A spokesperson for NASCAR had no comment on the potential sale, which sources tell ESPN is not a foregone conclusion. NASCAR does not comment on...