Which presidential campaign first introduced the innovative 'Square' mobile payment system to allow volunteers to sell campaign merchandise on-the-spot at rallies and events?

Political campaigns have evolved into sophisticated retail operations, with merchandise serving as both fundraising tools and walking advertisements. Campaign stores sell everything from the iconic hats to coffee mugs and custom apparel, generating millions in revenue while turning supporters into brand ambassadors. This poll tests your knowledge about one of the most successful political merchandise innovations in recent campaign history.

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Barack Obama's 2012 re-election campaign
Donald Trump's 2016 campaign
Hillary Clinton's 2016 campaign
Bernie Sanders' 2016 primary campaign