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.
An update on the diplomatic stand-off between Western nations and Iran over its nuclear program.
- Fathali Moghaddam Professor of psychology, Georgetown University author of "From the Terrorists' Point of View: What They Experience and Why They Come to Destroy"
- Romesh Ratnesar Assisting Managing Editor, TIME magazine
- David Ignatius Columnist, "The Washington Post;" co-moderator of "PostGlobal" on washingtonpost.com.
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