The Republican Candidates’ Seven-Car Pileup

I don’t think last night’s Republican presidential-primary debate on Fox News was poorly run. But multi-candidate primary-debate organizers face a persistent structural problem. If you ask every candidate to weigh in on the same topic, you often end up with seven candidates giving more or less the same answer — “I’m determined to secure the border.” “When I’m president, America will have a secure border.” “Everybody says they’re going to secure the border, but I’m the one you can count on to do it.” There are exceptions, but by and...