Former eBay boss Meg Whitman isn't really a California cowgirl, but she plays one on the cover of Fortune magazine. When Whitman, who wants to be California's next governor, did a photo shoot in Half Moon Bay for the lead story in this week's issue, she used a four-legged prop named Brandy. In a note at CNNMoney.com, Fortune editor at large Patricia Sellers revealed that it was a rent-a-horse that appeared on the cover and in a picture inside. "The horse on the cover, Brandy, isn't Whitman's, but she does ride in Telluride, Colorado, where she and her neurosurgeon husband,...