On immigration, Bush charged, with an irate tip of his head, that Kerry doesn’t understand the borders if he can say that they’re less well protected today than they were four years ago, and Kerry calmly and quietly responded, “4000 people a day.” It was a simple but deadly rebuke, that seemed to say, “You can say I don’t understand, Mr. President, but I know this stuff inside and out, and it’s obvious you don’t.”