Mark Halperin

Mark Halperin, Senior political analyst for 'Time' magazine & John Heilemann of 'New York' Magazine; Tim Wu on Net Neutrality; Edmund Morris on his book 'Colonel Roosevelt'

Steve Kroft reports on the virtual fence; Also, Anderson Cooper reports on a new book which reveals campaign secrets; Plus, Lesley Stahl on research to possibly revive extinct animal populations.

As more and more species on earth edge towards extinction, scientists are exploring new ways to save threatened species from the fate of the dinosaurs. Along the way, there is the possibility of using DNA technology to resurrect some of the already extinct species! Lesley Stahl of "60 Minutes" reports.

One of the most memorable presidential races in decades pits the iconoclast John McCain against the newcomer Barack Obama; a heroic former prisoner of war against the first African-American major party nominee. The 20th anniversary broadcast of "The Choice" examines the personal and political biographies of these men and goes behind headlines to discover how they arrived at this moment and what their very different candidacies say about America.