While I doubt he'd've particualrly helped CART grow directly, he would've certainly made it harder for NASCAR to extend past its southern audience, and made it harder for other guys form outside the southern states (such as Ryan Newman and Tony Stewart) to consdier NASCAR or be given a chance by team owners. What's more, he'd've been anotehr American star on the grid, at a time when non-American guys were starting to have a huge presence (in 1993 the highest-placed American was behind guys form England, Brazil and Canada, only 1 of which had any races on the schedule)
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