Which presidential campaign first pioneered the online campaign store model that has now become standard practice for political fundraising?

Campaign merchandise has evolved from simple buttons and yard signs to sophisticated branded products that generate millions in funding and create walking advertisements for candidates. In recent elections, campaign stores have become increasingly important marketing tools, with distinctive products often going viral and entering popular culture. How well do you know the history and impact of political merchandise in modern campaigns?

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Barack Obama's 2008 campaign
George W. Bush's 2004 campaign
Hillary Clinton's 2016 campaign
Donald Trump's 2016 campaign