Getting your name out there to maybe assist in attaining a lower level of office - mayor, city councillor, school board, etc.
Gaining experience to run again.
Making a point.
The fun and thrill of the campaign - going to debates, being quoted, becoming "known."
Being treated by some as temporarily just as important as some very powerful people.
Get used to me. Black, confident, cocky; my name, not yours; my religion, not yours; my goals, my own; get used to me. -Muhammad Ali