AP Photo

Reading Barack Obama’s “Dreams from My Father,” the US president’s beautifully written reflections on his early life and identity, most people are struck by his cool and intellectual approach. This is not to say that he is unemotional. Obama can rage and weep. But he rarely seems to act on the basis of raw sentiment or instinctive prejudice.

Pragmatic and highly intelligent as Obama is, sooner or later every issue receives the full attention of his forensic curiosity. Recalling Hillary Clinton’s famous Democratic primary television advertisement, Obama, it turns out, is exactly the sort of president that most of us would want to have in the post for that 3:00 a.m. phone call...