a disk-shaped pin worn by a supporter of a political candidate, usually bearing the name of the candidate and often a slogan or the candidate's picture.
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How to use campaign button in a sentence
A campaign button on his lapel showed him in a smile and a suit, and advertised his name and lever.The Strange and Mysterious Death of Mrs. Jerry Lee Lewis | Richard Ben Cramer | January 11, 2014 | THE DAILY BEAST
Stealthily his hand moved to his ticking shirt and removed the campaign button.Pee-wee Harris on the Trail | Percy Keese Fitzhugh