It’s hard to look at Ted Cruz’s face. He’s a brilliant orator with a sharp legal mind. But his expression unsettles me. I know my reaction is visceral and automatic, but as a neurologist it is my business to notice things out of the ordinary and probe them. The Senator’s atypical expressions leave me uneasy. Before I say why, note how many colleagues and former associates "loathe" him. A Bush alumnus told The New York Times' Frank Bruni, “Why do people take such an instant dislike to Ted Cruz? It just saves time.†Former Senate Majority leader Bob Dole says,...