I'm not sure Lincoln would fare well if he were a presidential candidate today.

Lincoln was not a good impromptu speaker; he was at his best when he could read from a carefully prepared manuscript, though maybe a teleprompter could have helped that!

In Lincoln's day a President's religion was a very private affair. There were no public prayer meetings, no attempts to woo the Religious Right. Few of Lincoln's countrymen knew anything at all of his religious beliefs.

Here is Theodore Roosevelt with all his faults and with all his strengths - the devoted family man, the passionate game hunter, the astute politician, the frustrated warrior. This is a deeply moving account of the last years of a very great man.

If you think about it, the historian's task is like that of the detective.

The big biography of Lincoln necessarily had to do so much with his political career, his ambitions, his accomplishments in public, with less time to spend on his private life, his inner life, and I thought this might be a way of getting at that.

I was able to sit at Lincoln's side and see how he thought and how he acted, and how he felt about what was going on around him. I felt the pressures that were on him. You can see what people were writing to him, how they were nudging him.