putsn 14 part series which the 2016 campaign into historical perspective. reaching across time, the contenders presents key figures have run for president and lost but changed medical history. each night we feature a different candidate. beginning with henry clay and ending with ross perot. 1 8 p.m. eastern time, august through the 14th. only on c-span3. >> this week on the presidency, historians talk about the process of writing a presidential biography. here is a preview. i think that you do a biography by -- because you have new information and feel that you can really do a fresh part. i have this epiphany when i was working on hamilton that he became momentary during the revolutionary war, hamilton was washington's aid had a feud with washington in hamilton realized that he had to justify the decision to quit washington staff. justify the decision to his father-in-law he was a very close friend of washington. he said dr. mark wrote a letter to his father-in-law that said, the great man and i have come to an open rupture. shall repent of his ill humor. h