SALIX, Iowa — It has become a bit. In these early days of Florida Gov. Ron DeSantis’ bid for president, Casey DeSantis joins her husband onstage, and the stories start to roll. There’s the one about bottled water from the Sea of Galilee, preciously savored for the children’s baptisms, that’s accidentally tossed out by a housekeeper at the governor's residence. Then there are Casey’s attestations of mom-hood, battling permanent marker scrawls on furniture and dragging by day’s end, when her husband comes home from work and she hands over the three children. The couple fires off all the indicators of...