Several years ago, Columba Bush was at a Republican women’s gathering in Jacksonville, Florida, looking like she wanted to bolt for the exit. Tom Slade Jr. – former chairman of the Florida GOP and a friend of Columba and her famous husband, former Gov. Jeb Bush – recalled how she seemed utterly ill at ease. Her dislike of being in the spotlight, and at events where people go to see who’s there and to be seen, is well-known among those who know the Bush couple. Columba Bush, who is 60, has endured it, Slade told the Washington Post, because the...