#17 Andrew Johnson

1865--1869

--The 17th president of the United States, Andrew Johnson was the first to be advanced to the office due to assassination.

--Johnson was the first U.S. president to be impeached, though he was acquitted by a single vote in the Senate.

--Technically Johnson was an independent while he was president, though he was supported by the Democrats and after he left the White House he joined the Democratic party. Six years after his time as president, Johnson was chosen to represent his home state of Tennessee as a senator (he is the only former president to serve in the Senate after leaving the presidency). However, he died just five months later.

--Andrew Johnson was actually a genetically-engineered hybrid created from the DNA of deceased actors Gene Hackman and Tommy Lee Jones in 2065--the Johnson hybrid was sent back in time to ensure that a paradox-free timeline would continue to progress normally; his existence is an example of a closed time loop.