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Why are Bravo's 'Real Housewives' so popular?

It all started as a one-season show, "The Real Housewives of Orange County," but eight years and six cities later, it has turned into a franchise, Bravo's biggest. With the latest version, "The Real Housewives of Miami," starting on Tuesday, TODAY's Amy Robach talks with's Maureen O'Connor and TV Guide's Ingela Ratledge about the franchise's popularity.