Which presidential candidate's campaign merchandise strategy in 2008 is widely credited with revolutionizing political branding by employing professional design principles typically used in retail?

Throughout American political history, campaign merchandise has played a crucial role in building candidate recognition and supporter identity. From buttons to yard signs, these retail products have evolved into sophisticated branding strategies that can make or break a campaign's public image. This trivia question explores a pivotal moment when campaign merchandise transcended traditional political marketing to become a cultural phenomenon.

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Barack Obama's 'Hope' campaign with designs by Shepard Fairey
John McCain's 'Country First' merchandise line
Hillary Clinton's 'Ready for Hillary' product collection
Ron Paul's grassroots-designed 'Revolution' merchandise