'Campaigner' definitions:

Definition of 'campaigner'

(from WordNet)
noun
A politician who is running for public office [syn: campaigner, candidate, nominee]

Definition of 'Campaigner'

From: GCIDE
  • Campaigner \Cam*paign"er\, n.
  • 1. One who has served in an army in several campaigns; an old soldier; a veteran. [1913 Webster]
  • 2. one who is campaigning, especially a politician running for elective office, or one of his/her supporters. [PJC]