Truman is now seen as a near-great president because he put in place the containment doctrine boosted by the Truman Doctrine and the Marshall Plan and NATO, which historians now see as having been at the center of American success in the cold war.

In counterfactual history, nothing is certain.

It is very difficult for [people] to accept the idea that someone as inconsequential as Oswald could have killed someone as consequential as Kennedy.

As someone who has more than a passing acquaintance with most of the 20th century presidents, I have often thought that their accomplishments have little staying power in shaping popular views of their leadership.

Truman is now seen as a near-great president because he put in place the containment doctrine boosted by the Truman Doctrine and the Marshall Plan and NATO, which historians now see as having been at the center of American success in the cold war.

One doesn't simply write about Lyndon Johnson. You get the Johnson treatment from beyond the grave - arm around you, nose to nose. I should admit that he also reminds me of my father, quite an overbearing and narcissistic character. And in some ways, he reminds me of myself. Another workaholic.

Like Lyndon Johnson, President Obama understands that timidity in a time of troubles is a prescription for failure.