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DES MOINES, IA - JANUARY 28:  Democratic presidential candidate Sen. Bernie Sanders (I-VT) speaks during a forum at Roosevelt High School on January 28, 2016 in Des Moines, Iowa.  (Photo by Joe Raedle/Getty Images)
DES MOINES, IA - JANUARY 28:  Democratic presidential candidate Sen. Bernie Sanders (I-VT) speaks during a forum at Roosevelt High School on January 28, 2016 in Des Moines, Iowa.  (Photo by Joe Raedle/Getty Images)

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CNN Poll: Clinton's lead shrinks

Katrina vanden Heuvel, editor and publisher of 'The Nation,' gives perspective on Bernie Sanders.

CNN Poll: Clinton's lead shrinks

Katrina vanden Heuvel, editor and publisher of 'The Nation,' gives perspective on Bernie Sanders.