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.
A panel of political analysts joins Diane for a discussion of the results from the latest round of Democratic presidential primaries from seven states.
- Ron Elving Washington editor for NPR.
- Norman Ornstein Is resident scholar at the American Enterprise Institute; coauthor with Thomas Mann of "The Broken Branch: How Congress Is Failing America and How to Get It Back on Track."
- Thomas Mann Senior fellow at the Brookings Institution and co-author of "The Broken Branch: How Congress Is Failing America and How To Get It Back On Track"
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