The Merchant of Venom. The Master of Insults. Mr. Warmth. These were just a few of the labels given to actor and comedian Don Rickles, who in the course of a 40-year career on stage, film and television, came to define the tone and persona of the insult comic. But despite his withering barrage of put-downs, Rickles remained a favorite of celebrities and audiences alike, thanks to both an unflaggingly quick wit and a genuine affection for his targets. That likeability allowed Rickles to enjoy stardom well into his eighth decade, watching his fame blossom even further, thanks to his