depth, our three hour conversation with walter isaacson who's biographies include ben franklin, albert ien stien and the international best-seller on steve jobs and on american history tv on cspan 3 saturday at 6:00 p.m. eastern on the civil war. boston college history professor heather cox richardson on how the cowboy became symbolic of a newly unified america on sunday at 6:00 we will tour the house that was the headquarters of the american red cross and learn about its founder. let us know what you think about the programs you're watching. call us at 202-626-3400. e-mail us@comments@cspan.org. join the cspan conversation. like us on facebook. follow us on twitter. >> keep track of the republican led congress and follow its new members through its first session on cspan cspan 2, cspan radio and cspan.org. >> the supreme court recently heard a case regarding the length of time the police can conduct a traffic stop. once an officer issues a ticket or warning for a traffic infraction, drivers should be allowed to leave. the justice department argue police should be able to extend the traffic stop