Pulitzer Prize-winning biographer Jon Meacham on the evolution of Abraham Lincoln's moral principles and political leadership -- and what the era of Lincoln can teach us about the state of our democracy today.
Surgeon, oncologist, professor, and medical spokesman Lasalle Leffall believes "When you give people hope… you grant them one of the greatest of all human joys: the joy of anticipation." He joins Diane to talk about his new biography.
- LaSalle Leffall Cancer surgeon, Howard University College of Medicine professor, former president of the American Cancer Society.
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