When we think of Abraham Lincoln, it’s of the fully-formed president who oversaw one of the most difficult transitions in American history. The details of how he became that man, however, are also fascinating. This hour, we’ll talk to Stephen Harrigan about “A Friend of Mr. Lincoln” (Knopf), a fictionalized look at the 16th president’s formative years. Harrigan speaks tonight during Authors Live! at Highland Park United Methodist Church.