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.
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- Gerald Galloway Research Professor, Glenn L. Martin Institute Professor of Engineering, University of Maryland former brigadier general in U.S. Army Corps of Engineers
- Mark Svoboda Climatologist, National Drought Mitigation Center
- Richard Heim Meteorologist NOAA's National Climatic Data Center
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