Which product experienced a dramatic sales surge after President Obama was repeatedly photographed using it during his presidency?

Throughout American history, presidential preferences for certain products have created significant market impacts and brand boosts. When a president publicly uses or endorses a product (intentionally or unintentionally), it often leads to major sales increases and cultural phenomena. Test your knowledge about these influential presidential product connections that have shaped retail marketing strategies and consumer behavior in unexpected ways.

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BlackBerry smartphones
Apple iPad
Montblanc pens
Fitbit fitness trackers