WordNet (r) 3.0 (2006):

public servant
    n 1: someone who holds a government position (either by election
         or appointment)

Moby Thesaurus II by Grady Ward, 1.0:

21 Moby Thesaurus words for "public servant":
   bureaucrat, civil servant, functionary, functionnaire, holdover,
   incumbent, ins, jack-in-office, lame duck, mandarin, new broom,
   office-bearer, officeholder, officer, official, officiary,
   petty tyrant, placeman, president-elect, public official,
   red-tapist