One who practices electioneering; a political campaigner or operative.
From 'electioneer' plus the suffix '-er' (one who does). This is a somewhat redundant formation since 'electioneer' already means 'one who electioneers,' making 'electioneerer' essentially a doubled agent noun.
This word is delightfully redundant—it's like saying 'one who does election-campaign-ing' rather than just 'one who election-campaigns.' It's what happens when English-speakers add suffixes to words that already contain agent nouns, creating awkward doublings!
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