When it comes to Donald Trump's work as a "Saturday Night Live" host, the Republican frontrunner's preeminent late-night impersonator has some words of admiration for his work ethic."A lot of people say he is cocky or full of himself. Maybe he is, but he is also the most positive person I have ever seen except the athletes that have come on the show," Darrell Hammond told The Hollywood Reporter in an interview published Thursday.Referring to Trump's hosting gig last fall, Hammond said that Trump went the extra mile."You know, he did not believe himself to be an actor.