On the eve of the New York primary, Bill Moyers sat down to talk with Rick Shenkman, the historian, editor and publisher of the indispensable website History News Network. Shenkman tells Bill that it’s the voters and their emotions, not the candidates and their ideas, that will determine the outcome of the election in November.

Shenkman’s latest book is ‘Political Animals: How Our Stone-Age Brain Gets in the Way of Smart Politics.’