A campaign poster word is a phrase or slogan used to promote a political candidate or party. The three crossword solutions for the term 'campaign poster word' are ELECT (5 letters), VOTE (4 letters), and REELECT (7 letters). ELECT is a verb meaning to choose by VOTE, while VOTE is a noun meaning a formal expression of opinion or choice in an election. Reelect is a verb meaning to ELECT someone to a second term in office.