06/21/2006 11:00PM

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Thistledown canceled its live racing Thursday after race 8 because of severe thunderstorms. The balance of the day's races from River Downs, Thistledown's 7 and 7 racing partner, were run as scheduled. . . . A cloned mule defeated naturally bred mules on Wednesday at the Stockton, Calif., fair. The mule, Idaho Gem ($4.40), won a 350-yard race by 2 1/2 lengths in 20.724 seconds.