Considering the experience that one of its co-authors has concerning electoral matters, today's article by Ken Blackwell and Bob Morrison on the eligibility of Ted Cruz, Marco Rubio, Nikki Haley, and Bobby Jindal to run for president ought to end the matter. It won't, of course. Debates over that topic have proven not only self-perpetuating but self-generating -- every time you think they've died down for good, they flare up once again.