Poet Brad Leithauser, who’ll be reading from his latest collection of poetry, Toad to a Nightingale, Saturday afternoon at Politics and Prose, published his first collection of poetry, Hundreds of Fireflies, in 1982. He was probably unprepared for the attention it received, not so much for what it contained, but for what it lacked: the collection was, for the most part, completely absent of poetry influenced by High-Modernist, experimental “free verse.” In other words: poetry…