I think you're wrong. I think Johnson WAS impeached and avoided conviction by one vote. Therefore we now have TWO impeached presidents in our woodpile.
yes
Andrew Johnson (not to be confused w/ Andrew JACKSON - the Scots-Irish Prez mentioned in this article) was not elected Prez. He was the VP who became Prez upon Lincoln's assassination shortly into his second term. I believe Johnson was not the VP during Abe's first term.
ANSWER: "Johnson, Johnson, Johnson & Johnson"
QUESTION: "Name two Presidents and a floor wax"
--- The Great Karnak