On Comedy Central’s “The Daily Show,” Wyatt Cenac plays an aloof Senior Black Correspondent named Wyatt Cenac. The real Cenac, 36, comments on the world around him not through TV journalism but through comedy, including stand-up — an act he brings to Johnny D’s in Somerville on Friday. “I cannot do impressions to save my life,” Cenac says. “The only impression I can do is a bad Bill Cosby impression. That kind of becomes my impression for anything.”
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