Which U.S. President's product endorsement led to a 420% sales increase for a specific brand within a month after leaving office?

In the complex world where politics meets consumer products, government officials often make strategic endorsements that can significantly impact a brand's public perception and sales. This trivia question explores a notable historical case where a political figure's product endorsement created a lasting impact on both the political landscape and consumer market. Test your knowledge about the intersection of politics and product marketing!

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Barack Obama's endorsement of Fitbit fitness trackers
George W. Bush's endorsement of Stetson cowboy hats
Bill Clinton's endorsement of Transitions eyeglass lenses
Ronald Reagan's endorsement of Jelly Belly jelly beans