What is the author's tone in the nonfiction book, Al Franken, Giant of the Senate?

Despite Franken's frustration that he, as a politician, cannot be separated from his history as an off-color comedian, a humorous and lighthearted tone dominates the text. His footnotes are an exceptional place to spot his dry yet topical humor. He even offers a warning in the foreword in which he cautions the reader with "a note on style from the author," in that he would be periodically censoring swears with words like "poppycock" and "dunderhead" in his footnotes (2). In another footnote, Franken interjects a meaningless yet comical aside and then adds, "see, this is the kind of footnote you're just not going to get in Condoleezza Rice's memoir" (47). Franken simultaneously understands the power of his humor and understands that his memoir will be markedly different from other politicians' memoirs; he uses his subtle, sometimes eye-roll-inducing humor to separate himself from the run-of-the-mill establishment politician.