The American campaign, Persian polls back centrists, Mind-blowing science of CRISPR

Paul Krugman and Bret Stephens debate the rising tide of Trump and who's responsible for it. Also, a real-life cyber-attack that put a quarter million people in the dark: could it happen in the U.S.? Vali Nasr and Thomas Erdbrink on what Iran's elections mean for the world. Plus: Clustered regularly-interspaced short palindromic repeats (CRISPR), could this new bleeding edge technology one day allow a rogue nation to create a master race? GUESTS: Bret Stephens, Paul Krugman, Vali Nasr, Thomas Erdbrink, Jennifer Doudna

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