Marlo Thomas and Phil Donahue talk about what makes a marriage last

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As they approach their 40th wedding anniversary, actress Marlo Thomas and daytime talk trailblazer Phil Donahue join TODAY from their home to talk about their new book, “What Makes a Marriage Last,” featuring reflections from many celebrity couples, including Ron and Cheryl Howard, Kyra Sedgwick and Kevin Bacon, and Holly Robinson Peete and Rodney Peete.