Well if you're unfamiliar with the term "Boothie" now's your chance to learn something new...and quite fascinating. Dave is indeed a self-styled Boothie. Once a derogatory term used to dismiss those who studied Lincoln's assassin, he's reclaimed it and has dedicated his historical pursuits to the study of the man and the conspiracy - as part of a serious scholarly effort to add to the comprehensive narrative of the nation's martyred president.