>> jeff: former senator goc mcgofer earn died in his home state of south dakota early today. he was 90 years old and suffering from cancer. a bomber pilot during world war ii he was a leading critic of the conflict in vietnam. president obama paid tribute to mcgovern today saying this hero of war became a champion of peace. bob orr looks back. >> reporter: three time democratic presidential candidate george mcgovern won his party's nomination in 1972. >> i accept your nomination with a full and grateful heart. >> reporter: gary hart who would go on to run for president twice himself was mcgovern's campaign manager. and a young vut president bill clinton ran mcgovern's campaign operations in texas. mcgovern, an unabashed liberal called for an immediate end to the vietnam war. but he lost in a landslide