Somewhere on the spectrum between impish and offensive lives the career of Sacha Baron Cohen, the British-born comedian who, through his various TV sketch shows and movies, has gleefully pressed political and cultural hot buttons for nearly 20 years now. As his controversial new Showtime series "Who Is America?" continues to generate chatter (and headaches) for the public figures duped into appearing on it (Sarah Palin and Dick Cheney among them), here's a look back at Cohen's characters/caricatures.Dave Hogan/Getty Images AS ALI G Anthony Harvey - PA Images/PA Images via Getty Images
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