The Collaborative International Dictionary of English v.0.48:

campaigning \campaigning\ n.
   The campaign of a candidate to be elected.

   Syn: candidacy, candidature, electioneering, political
        campaign.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

campaigning
    n 1: the campaign of a candidate to be elected [syn:
         campaigning, candidacy, candidature,
         electioneering, political campaign]