Jeb Bush can trace some of his most appealing qualities as a potential presidential candidate for a diversifying electorate to his 40-year partnership with his Mexican-born wife, Columba. The couple speak Spanish to one another, and their lives have been immersed in Hispanic culture and the immigrant experience. But Columba’s intense distaste for the public arena is one of the issues weighing most heavily on the former Florida governor as he grapples with whether to run for the White House in 2016, according to interviews with friends, former staffers and GOP donors close to the family. -snip- Columba Bush at...