If ever there were a moment for President Obama to learn from history, it is now, in the wake of Friday’s shootings at the elementary school at Newtown, Conn. The timely lesson for Obama, drawn from the experience of Lyndon B. Johnson — the last president to aggressively fight for comprehensive gun control — is this: Demand action on comprehensive gun control immediately from this Congress or lose the opportunity during your presidency. In the aftermath of the assassination of Robert F. Kennedy (just weeks after the fatal shooting of Martin Luther King Jr. and only a few years after...
