Winston Churchill will always be remembered for his handling of the Axis powers in World War II; President George W. Bush and Rudy Giuliani are inextricably linked to their responses to 9/11. Many world leaders are known best for actions they took in times of great crises. For our nation’s current leader, the history books are still being written, and a second presidential term is a possibility. We wanted to preview what history may say of President Obama’s handling of the social, economic and military crises that have so far marked his first term in office. How will future generations remember him? For a long view, we’re speaking with Barbara Leaming, author of “Churchill Defiant: Fighting On: 1945-1955.”