What do the impeachments of Presidents Andrew Johnson and Donald Trump have in common? Maybe more than you think. First, the most obvious similarities. Both men were considered outsiders by many party insiders. Both were impeached on very flimsy legal grounds. Both presented unique challenges for Republican Congressional leaders. Andrew Johnson remains an enigma even to many who call themselves political junkies. His personal story is compelling. Not even Lincoln came from a more unlikely circumstance than Andrew Johnson. He was born in a two-room shack in Raleigh, North Carolina. His illiterate parents scratched out a living working in a tavern. According to encyclopedia.com, Johnson never went to school. Andrew learned the tailoring trade and gradually acquired some basic reading skills.