The Collaborative International Dictionary of English v.0.48:

Scrutineer \Scru`ti*neer\, n.
   A scrutinizer; specifically, an examiner of votes, as at an
   election.
   [1913 Webster]

WordNet (r) 3.0 (2006):

scrutineer
    n 1: someone who examines votes at an election [syn:
         scrutineer, canvasser]