You don't "volunteer" to be elected into an office -- you are nominated or you nominate yourself.
S: (v) nominate, put up, put forward (propose as a candidate for some honor)
S: (v) nominate, propose (put forward; nominate for appointment to an office or for an honor or position) "The President nominated her as head of the Civil Rights Commission"
S: (v) name, nominate, make (charge with a function; charge to be) "She was named Head of the Committee"; "She was made president of the club"
S: (v) appoint, name, nominate, constitute (create and charge with a task or function) "nominate a committee"
"Nomination" is part of the process of selecting a candidate for either election to an office, or the bestowing of an honor or award. "Presumptive nominee" is a term used when a person or organization believes that the nomination is inevitable. The act of being a candidate in a race is called a "candidacy."