Andrew Johnson was a slave-holding Democrat. He was a racist who wanted to restore the Democrat South as it was. He was against giving blacks the right to vote and fought the 14th amendment. He was impeached by Republicans for intentionally violating the duly enacted law of the land. He avoided conviction by one vote.
He was not an honorable man.
http://www.supremelaw.org/authors/lyon/tdocws.htm
After a great deal of reading and researching period documents I tend to believe him more that what we were taught in skool.