The Romney campaign, renowned for its oppo-heavy strategy, didn’t even have an oppo book on Rick Santorum a few days before the Iowa caucuses, so surprised were they by his surge. Jon Huntsman nearly decided in November to leave the GOP and run as an independent. And before one of the debates, Rick Perry sang “I’ve Been Working on the Railroad” in a restroom. These details are from Mike Allen and Evan Thomas’ new e-book, Inside the Circus, as are these additional factoids below. Mitt Romney raised millions in March by warning would-be donors a brokered convention could mean a...