Allan Pinkerton, President Abraham Lincoln, and Major General John A. McClernand standing outside a tent on October 3, 1862.
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"If there was a fire in my house," O'Brien says, "I'd get my wife and child out, and then I'd run back in and get a Lincoln signature that I own--a pardon that he signed. I think I look at it every day." Asked why, he pauses for a second. "He's become such an otherworldly figure, such an iconic figure. But the fact is, he's a person. I guess it's inspiring to me that people are capable of being that cool."
Shenk is the author of Lincoln's Melancholy: How Depression Challenged a President and Fueled His Greatness, to be published in September by Houghton Mifflin
Visit us at time.com/lincoln for more stories and photos, such as Hugh Sidey's look at the history of the Lincoln Bedroom