Hmmm... when was the last time a losing candidate for the Presidency was the Candidate during the following Election?
Probably the last loosing candidate to run again four years later was Adlai Stevenson. He ran in 1952 against Eisenhower, lost, and ran again in 1956 against Eisenhower and lost again.
For the record, John F'n Kerry is no Adlai Stevenson.