Which campaign merchandise item first gained widespread popularity during the 1896 US presidential election, revolutionizing political branding with mass production of over 5 million units?

Campaign merchandise has evolved dramatically throughout political history, with various items serving as powerful branding tools for candidates. One particular campaign item revolutionized political marketing in the late 19th century, becoming an iconic symbol of American electoral politics that continues to this day. Test your knowledge about this significant shift in political campaign packaging and branding!

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Celluloid campaign buttons with candidates' images
Campaign yard signs with wooden stakes
Printed paper campaign flyers
Embroidered campaign handkerchiefs