Rating is available when the video has been rented.
This feature is not available right now. Please try again later.
Published on Sep 14, 2012
For more coverage: http://to.pbs.org/Qao5NO Increasingly, behavior psychology concepts like 'social pressure' can be used not only to get voters out to the polls but getting them to vote for a specific candidate. Hari Sreenivasan talks to journalist Sasha Issenberg about his latest book, "The Victory Lab: The Secret Science of Winning Campaigns.