As Ron DeSantis pursues the presidency, his wife’s role is limitless. Casey, 42, isn’t a typical political spouse. Why does that inspire so much fear? Her rise in TV and insular marriage tell the story.“Where is she at?”Ron was always asking.Ron DeSantis was in the middle of a picnic in Sioux Center, Iowa, bent over a homemade poster. Four photos, arranged in a neat grid, stared back at him: Ron and Casey, smiling on election night, 2022; Ron and Casey, smiling outside the governor’s mansion, 2021; a headshot of Ron; a headshot of Casey. The governor signed his name in...