Nouns

(n)solicitor, canvassera petitioner who solicits contributions or trade or votes
(n)scrutineer, canvassersomeone who examines votes at an election
(n)pollster, poll taker, headcounter, canvassersomeone who conducts surveys of public opinion“a pollster conducts public opinion polls”, “a headcounter counts heads”
(n)canvassera person who takes or counts votes