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DES MOINES, IA - JANUARY 29:  Democratic presidential candidate Hillary Clinton speaks during a "get out the caucus" event at Grand View University on January 29, 2016 in Des Moines, Iowa.  (Photo by Justin Sullivan/Getty Images)
DES MOINES, IA - JANUARY 29:  Democratic presidential candidate Hillary Clinton speaks during a "get out the caucus" event at Grand View University on January 29, 2016 in Des Moines, Iowa.  (Photo by Justin Sullivan/Getty Images)

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    State: 37 pgs. of Clinton emails too classified to release

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State: 37 pgs. of Clinton emails too classified to release

CNN's Jim Sciutto reports.

State: 37 pgs. of Clinton emails too classified to release

CNN's Jim Sciutto reports.