Marlo Thomas & Phil Donahue on the secrets of lasting marriages

Marlo Thomas and Phil Donahue are celebrating their 40th anniversary this spring. To mark the occasion, the actress and talk-show host wrote a book, "What Makes a Marriage Last,” in which 40 famous couples share secrets on how their marriages have stood the test of time. Jane Pauley reports. Subscribe to the "CBS Sunday Morning" Channel HERE: http://bit.ly/20gXwJT Get more of "CBS Sunday Morning" HERE: http://cbsn.ws/1PlMmAz Follow "CBS Sunday Morning" on Instagram HERE: http://bit.ly/23XunIh Like "CBS Sunday Morning" on Facebook HERE:   / cbssundaymorning   Follow "CBS Sunday Morning" on Twitter HERE: http://bit.ly/1RquoQb Get the latest news and best in original reporting from CBS News delivered to your inbox. Subscribe to newsletters HERE: http://cbsn.ws/1RqHw7T Get your news on the go! Download CBS News mobile apps HERE: http://cbsn.ws/1Xb1WC8 Get new episodes of shows you love across devices the next day, stream local news live, and watch full seasons of CBS fan favorites anytime, anywhere with CBS All Access. Try it free! http://bit.ly/1OQA29B --- "CBS Sunday Morning" features stories on the arts, music, nature, entertainment, sports, history, science, Americana and highlights unique human accomplishments and achievements. Check local listings for CBS Sunday Morning broadcast times.