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Ahead on the 8/4 Maddow show

Tonight's guests include:Ezra Klein, columnist for The Washington Post and Bloomberg and msnbc policy analyst    Robert Frank, professor of economics

Tonight's guests include:

Ezra Klein, columnist for The Washington Post and Bloomberg and msnbc policy analyst    

Robert Frank, professor of economics at Cornell University   

David Corn, Washington bureau chief for Mother Jones and msnbc political analyst  

Michael Isikoff, NBC national investigative correspondent

Executive producer Bill Wolff shares a preview of tonight's show: