I guess the two I knew the most about were Frederick Douglass and Lincoln himself - and not that I knew much about either! I definitely have some reading I want to do!
The information about Pinkerton and his organization was fascinating. I'd read about him, but only in conjunction with his strike-breaking decades later. I definitely saw him in a different light! And, of course, there was Kate Warne, about whom I'd heard nothing.
I also gained respect for Seward. Man, he lived through a lot of history, influencing much of it during his time in government. I'd like to learn more about him, too.