Democrats are facing two crucial questions: (1) Keep Joe or dump Joe; and (2) in the event of the latter, do you bump Vice President Kamala Harris to the top of the ticket or hold an open convention? Most conversations between Democrats never get past these two questions. Instead, they dissolve into shouts of “You don’t know!” “Well, you don’t know either!” But if two Democrats could somehow agree that Harris should lead the ticket, the obvious follow-up question is: Who would be the best choice for vice president But most governors relish their jobs as CEOs of their...