It would be pleasant to believe that some of Lincoln's DNA is actively swimming around in somebody's soup, but all the evidence is against it. And of course, there's always the risk that what we might get would be more Robert Todd Lincoln than Abraham Lincoln.

Modern presidential debating only started with Richard Nixon and John F.Kennedy in 1960, although the proximity of that to the Lincoln-Douglas centennial is more than accidental. The reason is, I think, the medium. Abraham Lincoln and Stephen A. Douglas were talking, but the talking was in terms of logic, development, and reasoning. Television, as a medium, resists those qualities in speaking - it favors quick cuts, one-liners, and talking points. I think the modern debates are largely the prisoners of the televised medium

Stephen A.Douglas was a risk-taker by temperament; I expect that Lincoln - Douglas debates represented another risk he just couldn't resist. He lived to regret it.

Abraham Lincoln did have intellectual instincts, a tremendous curiosity on a broad range of subjects, and a near-photographic memory for what he read. He was, at the end of the day, a politician: politics were his heaven, said William Herndon. But Lincoln did take comfort in ideas and books, more so than almost any other president, and he went to books and ideas in moments of perplexity to sort things out. Philosopher, no, but thoughtful and "surprisingly well-read" for his day.

We still know so little about how the brain interacts with the body chemistry or, for that matter, whether we should be talking about the brain or the mind, that it would be perilous to hazard any guess about the way Abraham Lincoln's biological health may or may not have affected him. Of course, we don't have Lincoln on hand to ask him directly; but even if we did, we still might not be able to make sense of how all the parts worked together.

It is possible to have pardon without forgiveness-a murderer can be pardoned by the governor, but that does not mean the victim's family has forgiven him. And there can be forgiveness without pardon.

I don't know that there has ever been a time when Abraham Lincoln didn't stand head-and-shoulders above all other presidents in the historians' eye. But relatively speaking, there have been peaks and a troughs. One peak was in the 1910s-20s; a major trough was in the 1970s-80s. We are certainly on a peak again, something which began in 1994 with Michael Burlingame's 'The Inner World of Abraham Lincoln,' which showed in fabulous detail how many new and untapped sources were available on Lincoln.