In Play  ·   August 5, 2013

How Twitter changed the game

- In his book, "Collision 2012," Dan Balz describes the Denver debate President Obama lost on Twitter and the way social media transformed the campaign. ()

- In his book, "Collision 2012," Dan Balz describes the Denver debate President Obama lost on Twitter and the way social media transformed the campaign. ()

How Twitter changed the game (3:02)

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