In this excerpt from an interview with CBS News' Robert Costa, Pulitzer Prize-winning historian Doris Kearns Goodwin says, in the upcoming election, democracy is at stake, and that people should not tune out in the belief that their voice doesn't matter.

Watch Robert Costa's full interview with Doris Kearns Goodwin:    • Doris Kearns Goodwin on "An Unfinishe...  

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