david letterman made on them. >> and leno won the -- the ratings but david letterman had an impact on pop culture. >> thank you. that does it for us. stay tuned for the cnn special report, david letterman says goodbye. >> the follow is a cnn special report. >> i happen to be the most powerful man in american broadcasting. >> there really was no preparation. it was spontaneous. >> carson was the best show. jay created the anti-show. >> i have more memories show than my own life from that time. >> before kimmel, conan, seth,