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 look at the primary results in Texas, Ohio, Rhode Island, and Vermont and where the presidential campaign goes from there.
- Tad Devine Political consultant; senior strategist to the 2004 Kerry campaign and to the 2000 Gore campaign; director of delegate selection in the 1988 Dukakis campaign.
- John Dickerson Chief political correspondent for Slate.com and CBS political analyst and contributor. Author of "On Her Trail: My Mother, Nancy Dickerson, TV News' First Woman Star."
- Roger Simon Chief political columnist, "The Politico"
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