One of the best ways for a presidential candidate to prepare for a debate is to have someone act as a stand-in for their opponent. Sam Popkin helped President Jimmy Carter in 1980 by taking on the role of Ronald Reagan in mock debates. Popkin, now a political science professor at the University of California at San Diego, talks about what it's like to take part in the process. Hear Popkin and NPR's Steve Inskeep.
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