Bill Porter, an Exceptional Salesman Who Inspired a Film, Dies at 81 (Published 2013) Mr. Porter, who had cerebral palsy, was the inspiration for “Door to Door,” a 2002 TV film starring William H. Macy.
https://www.nytimes.com/2013/12/10/us/bill-porter-an-exceptional-salesman-who-inspired-a-film-dies-at-81.html