I worked for a leader who was sometimes accused of lacking in the smarts department. But no one I know who spent time with President George W. Bush was left with that impression.
Bush took an almost gleeful satisfaction in picking holes in arguments, as any half-prepared briefer quickly learned. He was also an avid reader of history. (I remember him passing along to me Judgment Days: Lyndon Baines Johnson, Martin Luther King Jr. and . . .