Geoffrey Cowan, author of Let the People Rule: Theodore Roosevelt and the Birth of the Presidential Primary, was interviewed on The Brian Lehrer Show, Monday, July 18th.

As part of the show’s ’30 Issues in 30 Weeks’ series, Cowan was joined by David Eisenhower, Director of the Institute for Public Service at the Annenberg School for Communication at University of Pennsylvania, to discuss the history of the Republican nomination conventions.

Listen here for the full interview.