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VP Debate: The many expressions of Joe Biden

Vice President Joe Biden shifted from laughter to sternness while debating U.S. Rep. Paul Ryan Thursday night, much to the delight of followers on Twitter and social media. <a href='http://www.cnn.com/2012/10/11/politics/gallery/vp-debate/index.html'>See highlights from the debate</a>.

Vice President Joe Biden shifted from laughter to sternness while debating U.S. Rep. Paul Ryan Thursday night, much to the delight of followers on Twitter and social media. See highlights from the debate.