What to make of Senator Ted Cruz? He is a very, very smart man who apparently believes that the median Republican presidential primary voter is very, very dumb. There’s some evidence for that proposition — Donald Trump still leads in the national polls — but Cruz’s strategy rests on the proposition that these voters will enjoy being condescended to. He may very well have chosen the most effective strategy. Senator Cruz is very much hardwired into the current us-and-them mood of the electorate, Right and Left, and though he is a creature of Princeton and Harvard Law whose household long...