The televised debate on Tuesday between Ted Cruz and Beto O'Rourke was a massacre. O'Rourke has been reluctant to debate Cruz from the beginning, and with good reason (ironically, as a rule, an incumbent shuns debate) – Cruz has successfully argued cases before the Supreme Court. O'Rourke was occasionally flustered and almost succeeded in hiding it, while Cruz was confident and occasionally laughed at some of his opponent's assertions. But more than that, Beto relied on vague generalities about specific questions and on a couple of questions tried the politicians' tried and true tactic of avoiding answering a question by...