Ahead of his hosting gig at Saturday’s White House Correspondents’ Dinner, Comedy Central’s The Nightly Show host Larry Wilmore already has won over the crowd, calling it “the most narcissistic room ever invented: journalists, politicians and Hollywood. And the president.” “The room could explode from the narcissism alone,” Wilmore told CNN’s John Berman today in a taped interview. Wilmore, who was Jon Stewart’s Senior Black Correspondent on The Daily Show, said the…