OK, we hesitated about this one. Sometimes the only listener we'll concede that Mitchell deserves during one of his more lackluster afternoons is Dan from Tyler, a regular caller to various public radio shows. Then again, finding five scintillating topics a week (and exciting speakers to discuss those topics) is no small undertaking. At least once or twice a week, Mitchell hits his stride, and he invites a well-informed guest and asks him well-informed questions. We favor the times he reads something in a mildly erudite periodical (The Nation, The National Review) and invites the author to discuss the subject.