With convention season upon us, more people feel inclined to wear their politics on their sleeves -- 100% combed ring-spun cotton sleeves, to be exact. Conduct a search online for "political t-shirts," and you'll find a dizzying variety of sentiments. San Mateo-based CafePress.com claims to be the first and biggest online marketplace for t-shirts and other gear designed by the public. Reporter: Rachael Myrow
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