Examine the transformation of Lincoln's views on slavery as Henry Louis Gates, Jr. and James Horton speculate on how different American history might have been had he lived to oversee a more extensive Reconstruction, in this video from the PBS documentary Looking for Lincoln. Tributes to Lincoln's enduring legacy from historians David Blight, Drew Gilpin Faust, Joshua Wolf Shenk, and former President Bill Clinton culminate in Barack Obama's 2008 presidential victory speech.